Laing Electric Heater-circulator

Laing Electric heater-circulator unit

...the wall mounted electric heat source for hydronic space heating systems

universal inexpensive reliable

� Laing Electric Heater www.lainginc.com

Electric heater-circulator unit

Contents

Electric heater-circulator unit - universal - inexpensive - reliable ..................................................................... 3

Laing Electric heater-circulator unit - design ................................................................................................... 4

Laing Electric heater-circulator unit - applications ............................................................................................ 5

Laing Electric heater-circulator unit - available models .................................................................................... 6

- Electric heater-circulator unit model EPR ............................................................................................ 7

- Electrically heated substation with manifolds model EPR SD/XD................................................. 8-13

- Electrically heated central substation model EPR Z ..................................................................... 14-15

- Electric single room heater model EHR � .......................................................................................... 16

- Electric single room heater with cabinet model EHR � S .................................................................. 17

Controls .......................................................................................................................................................... 18

Accessories, components, spare parts........................................................................................................... 19

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Electric- hydronic heating - universal - inexpensive - reliable

Benefits of the electric heating systemTo heat with electricity offers distinct advantages over other heating systems: - low purchase price,- low installation cost,- no cost for storing fuel,- no boiler compartment or storage rooms for oil necessary,- no cost for procurement of fuel,- no venting necessary, no cost for cleaning the venting,- low maintenance cost,- easy retrofit in existing apartments and houses,- highefficiencyatfullorparticalload- no exhaust gas or smell,- no potential danger by leaking gas or oil.

Withthenewenergyefficienthouses,theuseof electric heating systems is a viable alternative toconventionalheatingsystems.Theinfluenceofincreased consumption of primary energy at the power plant and higher cost of electricity is no longer a decisive factor. The greatly improved insulation of new buildings has drastically reduced the heat requirement. For an apartment with 1076 sq ft a total heating capacity of 6 kW (approx. �0473 BTU) is oftensufficient.Thismeansthatduringtheheatingperiod an average heating capacity of little more than � kW (approx. 68�4 BTU) will be needed. This can be achieved easier with an electric heat source rather than with today´s boilers, since their capacity is much too high for these applications. In addition, conventional heating systems have losses due to the start of a burner or due to partial load in spring and autumn whereas electric heaters use only energy when it is really needed. Another important incentive for the Electric heater-circulator unit can be given by the very attractive electricity prices offered by some utility companies for electric heating.

The Electric warm water floor heatingIn contrast to conventional hydronic systems where there are always a boiler and radiators, electricfloorheatingofferstwopossibilities,thedirect heating and indirect heating with warm water. The electric direct heating uses heating wiresplacedintotheslabwhichheatthefloorsurface. This method however has a distinctive disadvantage: Usually such heating wires produce heat independent from the surrounding temperatu-re.Ifforinstanceapartofthefloorisverywellinsulated by a plastic foam sofa, a cabinet or boxes, such heating can result in dangerously highfloortemperatures.Suchoverheatingcanonly be eliminated by integrating sensors which deactivate the heater partially when a set tem-perature is exceeded. With electric warm water heating, an electric boiler warms up water which is then circulated throughthefloorheatingsystem.Thewatercanonlydissipateheatwhilethefloorhasnotyetreached the water temperature. This system therefore has a self regulating effect. As soon as thefloorinanareaoftheroomhasreachedacertain temperature the temperature difference to the heat carrier becomes smaller so that in this area less heat is transferred to the floor.Thisalsoappliestoareasofthefloorwhichareexposedtodirectsun.Sincethefloorintheseareas has a higher temperature already, less heat from the heat carrier will be transferred due to the smaller temperature difference. This is not possiblewithdirectelectricfloorheating,sinceinthiscaseeachpartofthefloorreceivesthesame heat input. A further advantage of the electric warm wa-ter heating is the possibility to change the heat source. As soon as the favorable conditions for electricity are no longer available, the electric heater can be replaced by an oil or gas boiler. If this possibility is taken into account when the floor heating is designed, the change canbemade with little expense. Forthesereasons,theindirectelectricalfloorheating is always preferable to a direct electrical heating system.

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The Electric heater-circulator unit - the design

Cross-section through Electric heater-circulator EPR with spherical motor

In the design of the Electric heater-circulator unit we used a completely new approach. As the name „Electric heater-circulator“ suggests, the spherical motor pump with its whisper quiet operation and the electrical heater form an integral unit that guarantees themost compact and efficient heat source for ahydronic system. The spherical motor pump conveys the water through the rotor/impeller into the enlarged pump housing which contains the heating elements that heat up the water. The swirl created by the impeller im-proves the heat transfer from the heating elements. The heated water exits the unit through the dischar-ge port situated at the upper part of the housing. A safety valve and a bleed valve are placed at the high-est point of the heater-circulator unit. A pressurized expansion tank is attached to a port near the inlet port. A safety temperature cutout and an electronic control are placed in the terminal box. This control performs absolutely noiseless switching of the electric heating elements, provides constant temperature control, shuts the pump off with a time delay, and offers reliable protection against overheating. All parts of the Electric heater-circulator that come intocontactwiththeheatcarrierfluidarecompletelycorrosion resistant.

The Laing Spherical MotorThe circulator integrated into the Electric heater-circu-lator unit has a spherical motor developed by Laing. The spherical motor pumps have proven reliable in decades of successful service. The only moving part is the rotor/impeller unit that glides on a ceramic stationary ball suspended by electromagnetic forces. The rotor/impeller unit tiltsautomaticallytoallowsmalldirtparticlestoflowthrough. This bearing principle eliminates frozen shafts, leaky seals and noisy bearings. The pump therefore stays quiet over its lifetime.



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Electrically heated central substation for radiator heating

The Laing Electric heater-circulator unit - applications

The Laing Electric heater-circulator units are the least expensive heating solution. They are suited for single family houses as well as for apartments with either floorheatingor radiators.TheLaingElectricheater-circulator units are also ideal for room additions which cannot be integrated into the existing heating system or for vacation homes and weekend homes. A further applicationistheheatingofbathroomfloorsinsummer,which otherwise would require operation of the main heating system. Due to its compactness and its extremely quiet ope-ration the Laing Electric heater-circulator unit can even

be installed in apartments or hallways. Because of its flatdesigntheunitfitsinsidewall-mountedcabinetssothat no separate space is needed. Room temperature controls as well as outside temperature controls can easily be added to the integrated noiseless electronic constant temperature control. The installation of the Laing Electric heater-circu-lator requires only the electrical connection and the connectiontothefloorheatingsystemortheradiatorswhich results in low material and labor costs.

Typical applications

Electrically heated substation with manifolds for floor heating

Electric single room heater

Application example: Heating of bathroom floors when the main heating system is turned off.

Electrically heated central substation for radiator heating, floor heating and domestic hot water heating



Laing Electric heater-circulator units - Overview

Electrically heated substations with manifolds - Models EPR SD and EPR XDThese compact units reduce the installation time and expense to a minimum.Theunitscontainallcomponentsnecessaryforelectricfloorheating or electric radiator heating. They consist of an Electric heater-circulator unit with integrated electronic control, a plastic manifold, a flowmeterforeachloop,apressurizedexpansiontank,compressionfittingsandsafetydevices.Allcomponentsareassembledandfac-tory tested for leaks. The units can be delivered in a cabinet or on mounting bracket. All components coming in contact with the liquid are corrosion resistant.

Electrically heated central substation - Model EPR ZThe central unit combines an Electric heater-circulator unit with its elec-tronically actuated switch Model EPR, a pressurized expansion tank, con-nectionfittingsandsafetyfittingsinanextremelycompactpackage. The central unit should be used when there is not enough space for the compact unit or when the radiator heating only requires a single loop. All components coming in contact with the liquid are corrosion resistant and all units are factory tested for leaks.

Electric single room heater with cabinet - Model EHR 2 SThe electric heater-circulator unit - Model EHR � S is assembled into a cabinet to be mounted inside a wall. This reduces the installation costs for a separate single room electric heating to a minimum. In addition to the electric heater-circulator unit EHR, it contains an expansiontank,amanifoldfortwoloops,andvalvesforfilling.Theunithas been factory tested for leaks.

Electric single room heater Model EHR 2The Electric heater-circulator unit Model EHR is a compact small electric boiler with a heat performance of up to � kW. It is mainly intended for the heating of a single room. Thisheaterisespeciallysuitableforbathroomfloorheatingduringthetimeofyearwhenthe central heating system is shut off. It is also suited for the heating of room additions or rooms in attics. The heater contains a heating element of �000 W output, a quiet Laing spherical motor pump, a safety temperature limiter and a constant temperature control. Optionally a timer can be included to run the heating only at certain hours of the day. All compo-nents coming in contact with the liquid are corrosion resistant.

Electric heater-circulator unit - Model EPRThese Laing Electric heater-circulator units are compact electrically heated boilers with an integrated circulator pump. Their performance ranges from 6 to 15 kW, suf-ficientforthespaceheatingofasinglefamilyhomeoranapartment. Due to their compactness and a depth of only 4.33‘‘ they can be mounted inside a wall or placed in a recess. All components are corrosion resistant so that they can evenbeusedinfloorheatingsystemswithplastichoseswhicharenotoxygendiffusionproof. The use of the Laing spherical motor pump guarantees quiet operation over its lifetime. The integrated electronic control enables noiseless switching of the electric heating elements. A safety temperature limiter protects against overheating.



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Electric heater-circulator unit - Model EPR

DescriptionThe Electric heater-circulator unit contains 3 heating elements, a Laing spherical motor pump, a safety temperature limiter, an integrated electronic control, a safety valve, a pressure gauge, and a thermometer. All components are combined into a compact unit.The integrated electronic control has the following functions:- Electronic, absolutely noiseless solid state relays

for each electric heating element.- Electronicfixedtemperaturecontrol.- The three heating elements can be activated

either simultaneously, staged over time, staged by temperature or by the temperature gradient.

- Overheating protection for the solid state relays.- Switch selectable delayed pump shutoff. If this

function is activated, the pump will run as long as the heater is switched on and stay on for two additional minutes after the heating is turned off to remove the residual heat of the heating ele-ments.

- Electronicdryfireprotectionoftheheatingele-ments.

- Remote control input. The Electric heater-circulator unit can be activated by remote control. A room thermostat or an outside temperature dependent control can be connected to this input.

- The second and third heating element can be controlled by an external source.

- Electronic pump run test. If for any reason the pump does not work, the heating elements will not be activated.

- „Malfunction“ output. In case of any malfunction, a contact will be closed which can be connected to an external control system.

- Main switch. The main switch turns off the heater as well as the pump.

Models availableThe Electric heater-circulator units EPR are available in four sizes:

Model Heating Dim. Dim. Capacity A BEPR 6 3 x � kW 11.8‘‘ �4.3‘‘EPR 9 3 x 3 kW 11.8‘‘ �4.3‘‘EPR 1� 3 x 4 kW 14.4‘‘ �6.9‘‘EPR 15 3 x 5 kW 14.4‘‘ �6.9‘‘

(The dimensions refer to the drawing dimensional)

Technical SpecificationsModel EPR EPR EPR EPR 6 9 12 15Electric heatingElectric heating capacity 3x�kW 3x3kW 3x4kW 3x5kWVoltage �30 V �30 V �30 V �30 VRated Current �6.1 A 39.1 A 5�.� A 65.� A

Power supplyThe Electric heater-circulators can be connected to the following outlets: single phase/�30V

PumpType spherical motor pumpVoltage �30V/60HzWatts input 99W

Safety temperature limiterMaximum temperature �30°F ± 9K

Pump Performance Curve

Dimensions

0

2

4

6

8

10

12

0 2 4 6 8 10 12 14

Pum

p he

ad [f

t]

Flow rate [GPM]



Electrically heated substation with manifolds - Model EPR SD/XD

Customer requests for a unit that combines all com-ponents necessary for electrical heating led to the development of the electrically heated substation with manifolds. Installation of this unit requires only the mounting of the unit to the wall or into a recess and the connection of the pipes and electrical supply. With a minimal depth of only 4.41‘‘ the Laing sub-station can be placed inside almost any wall. Due to the adjustability of the cabinet the unit can be adapted to practically all conditions of installation.

InstallationDue to the compactness and the quiet operation of the Laing substation it is possible to install the unit in the same place where normally the heating circuit manifold is placed. This means that the piping connections and installation cost are reduced to a minimum. The easiest solution is the use of the steel cabinet which contains all components and which can be easily built into a wall. The only visible parts will be the frame and the door, both of which are galvanized and can be painted. This makes it possible to adapt the visible parts of the substation to the surrounding wall. If the unit is to be mounted inside an existing cabinet or recess, the substation on mounting brackets can be used. In this case, the unit is attached to the wall with the mounting brackets. If desired, the unit can be covered up after installation.

The components of the systemThe Laing Electrically heated substation with manifolds contains the following components:

Pressurized Expansion tankAll expansion tanks used in the Laing units are corro-sion resistant. The standard model of the substation is equipped with a 0.3 Gallon membrane expansion tank. Upon request, the unit can be equipped with an open stainless steel expansion tank.

Manifold with flowmeterAll Laing substations are supplied with plastic manifolds. The manifolds are assembled from individual segments so that even after installation the number of loops can be increased or decreased. The manifolds are equipped withaflowmeterforeachloop.Thismakesiteasytoadjust the individual loops without having to consider the valve characteristics.Theviewingglassoftheflowmeterisfilledwithwateronlyatstartup.Sincethefluidexchangethereafterisrestricted, the glass remains transparent even after prolonged use.Due to the double walled design of the manifolds the

heat transfer to the cabinet is minimized. All Laing substations are delivered complete with compression fittings.Therequiredsizeofthefittingsneedstobeindicated on the order.

Filling valveTo facilitate thefilling, thesubstationhasa checkvalvebuilt intothefeedside.Duringthefillingthisvalveisclosedsothatthewaterflowsthroughtheloops and not through the heater-circulator unit. The check valve replaces manual shut-off valves found on conventional manifolds.

CabinetThe cabinet of the substation for installation inside a wall is made of solid steel. The frame consists of hot galvanized sheet metal, the walls of the cabinet and the door are made from galvanized sheet metal. The depth of the cabinet can be adjusted from 4.4‘‘ to 6.97‘‘, its height from 39.37‘‘ to 4�.16‘‘.Depending on the number of loops, the width of the cabinet is either 39.37‘‘ or 5�.36‘‘. The mounting rails allow for horizontal and vertical adjustment of the substation inside the cabinet. Cabinets for installation on the wall are available upon request.

Mounting bracketsThe mounting bracket for substations without cabinet consist of a solid structure of metal rails. The rails will be attached to the wall. The substation then can be adjusted by sliding it on the rails. For transportation, the rails are mounted on a wooden board which has to be removed before installation.



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Design of the Laing electrically heated substation

Flow meter for each loop for balancing of the hea-ting circuits.

Adjustable steel cabinet for installation inside a wall, or an alternative mounting bracket.

Check valve to facilitate the fillingandpurgingofthepipeloops (check valve is closed duringthefillingandopensautomatically thereafter). Corrosion resistant pressu-

rized expansion tank.

Electric heater-circulator unit EPR with whisper-quiet Laing spherical motor pump, integrated electronic control, safety temperature limiter, pres-sure relief valve, pressure gauge, and thermometer.

Fittingsforfillinganddrai-ning with air purgers

Plastic manifold in seg-ments with compression fittings.



Substation with Electric heater-circulator unit EPR 6, EPR 9, EPR 1� or EPR 15includeplasticmanifoldsinsegmentsfor2to12loops,flowmeterforeachloop,checkvalve,fillinganddrainingfittings,fullyassembledinagalvanizedsteel cabinet for installation inside a wall, factory tested for leaks. The height of thecabinetsisadjustablefrom39.37‘‘to42.16‘‘(abovefinishedfloor).Thedepthis adjustable from 4.4‘‘ to 6.97‘‘.The dimensions are in inches and refer to the drawing on page 1�.

Model Loops Dimen- Dimen- Dimen- Dimen-

sion A sion B sion C sion D

6 kW (3x2 kW) 9 kW (3x3 kW)EPR 6 SD 0� EPR 9 SD 0� � 39.37‘‘ 14.�5‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 SD 03 EPR 9 SD 03 3 39.37‘‘ 16.4�‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 SD 04 EPR 9 SD 04 4 39.37‘‘ 18.58‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 SD 05 EPR 9 SD 05 5 39.37‘‘ �0.75‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 SD 06 EPR 9 SD 06 6 39.37‘‘ ��.91‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 SD 07 EPR 9 SD 07 7 39.37‘‘ �5.08‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 SD 08 EPR 9 SD 08 8 39.37‘‘ �7.�4‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 SD 09 EPR 9 SD 09 9 5�.36‘‘ �9.41‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 SD 10 EPR 9 SD 10 10 5�.36‘‘ 31.57‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 SD 11 EPR 9 SD 11 11 5�.36‘‘ 33.74‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 SD 1� EPR 9 SD 1� 1� 5�.36‘‘ 35.91‘‘ 17.3�‘‘ 11.81‘‘

12 kW (3x4 kW) 15 kW (3x5 kW) EPR 1� SD 0� EPR 15 SD 0� � 39.37‘‘ 14.�5‘‘ 19.89‘‘ 14.37‘‘

EPR 1� SD 03 EPR 15 SD 03 3 39.37‘‘ 16.4�‘‘ 19.89‘‘ 14.37‘‘

EPR 1� SD 04 EPR 15 SD 04 4 39.37‘‘ 18.58‘‘ 19.89‘‘ 14.37‘‘

EPR 1� SD 05 EPR 15 SD 05 5 39.37‘‘ �0.75‘‘ 19.89‘‘ 14.37‘‘

EPR 1� SD 06 EPR 15 SD 06 6 39.37‘‘ ��.91‘‘ 19.89‘‘ 14.37‘‘

EPR 1� SD 07 EPR 15 SD 07 7 39.37‘‘ �5.08‘‘ 19.89‘‘ 14.37‘‘

EPR 1� SD 08 EPR 15 SD 08 8 39.37‘‘ �7.�4‘‘ 19.89‘‘ 14.37‘‘

EPR 1� SD 09 EPR 15 SD 09 9 5�.36‘‘ �9.41‘‘ 19.89‘‘ 14.37‘‘

EPR 1� SD 10 EPR 15 SD 10 10 5�.36‘‘ 31.57‘‘ 19.89‘‘ 14.37‘‘

EPR 1� SD 11 EPR 15 SD 11 11 5�.36‘‘ 33.74‘‘ 19.89‘‘ 14.37‘‘

EPR 1� SD 1� EPR 15 SD 1� 1� 5�.36‘‘ 35.91‘‘ 19.89‘‘ 14.37‘‘



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Available Models and dimensions of Laing Electrically heated Substations with manifold on mounting brackets

Substation with Electric heater-circulator unit EPR 6, EPR 9, EPR 1� or EPR 15 includeplasticmanifoldsinsegmentsfor2to12loops,flowmeterforeachloop,checkvalve,fillinganddrainingfittings,fullyassembledonmountingbrackets,factorytestedforleaks.Theunitextendsapprox.39.37‘‘(abovefinishedfloor).The dimensions are in inches and refer to the drawing on page 1�. (Dimension A refers to the width of the wooden board on which the unit is mounted for trans-portation).

Model Loops Dimen- Dimen- Dimen- Dimen-

sion A sion B sion C sion D

6 kW (3x2 kW) 9 kW (3x3 kW)EPR 6 XD 0� EPR 9 XD 0� � 38.58‘‘ 14.�5‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 XD 03 EPR 9 XD 03 3 38.58‘‘ 16.4�‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 XD 04 EPR 9 XD 04 4 38.58‘‘ 18.58‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 XD 05 EPR 9 XD 05 5 38.58‘‘ �0.75‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 XD 06 EPR 9 XD 06 6 38.58‘‘ ��.91‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 XD 07 EPR 9 XD 07 7 38.58‘‘ �5.08‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 XD 08 EPR 9 XD 08 8 38.58‘‘ �7.�4‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 XD 09 EPR 9 XD 09 9 38.58‘‘ �9.41‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 XD 10 EPR 9 XD 10 10 38.58‘‘ 31.57‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 XD 11 EPR 9 XD 11 11 53.15‘‘ 33.74‘‘ 17.3�‘‘ 11.81‘‘

EPR 6 XD 1� EPR 9 XD 1� 1� 53.15‘‘ 35.91‘‘ 17.3�‘‘ 11.81‘‘

12 kW (3x4 kW) 15 kW (3x5 kW) EPR 1� XD 0� EPR 15 XD 0� � 38.58‘‘ 14.�5‘‘ 19.88‘‘ 14.37‘‘

EPR 1� XD 03 EPR 15 XD 03 3 38.58‘‘ 16.4�‘‘ 19.88‘‘ 14.37‘‘

EPR 1� XD 04 EPR 15 XD 04 4 38.58‘‘ 18.58‘‘ 19.88‘‘ 14.37‘‘

EPR 1� XD 05 EPR 15 XD 05 5 38.58‘‘ �0.75‘‘ 19.88‘‘ 14.37‘‘

EPR 1� XD 06 EPR 15 XD 06 6 38.58‘‘ ��.91‘‘ 19.88‘‘ 14.37‘‘

EPR 1� XD 07 EPR 15 XD 07 7 38.58‘‘ �5.08‘‘ 19.88‘‘ 14.37‘‘

EPR 1� XD 08 EPR 15 XD 08 8 38.58‘‘ �7.�4‘‘ 19.88‘‘ 14.37‘‘

EPR 1� XD 09 EPR 15 XD 09 9 38.58‘‘ �9.41‘‘ 19.88‘‘ 14.37‘‘

EPR 1� XD 10 EPR 15 XD 10 10 38.58‘‘ 31.57‘‘ 19.88‘‘ 14.37‘‘

EPR 1� XD 11 EPR 15 XD 11 11 53.15‘‘ 33.74‘‘ 19.88‘‘ 14.37‘‘

EPR 1� XD 1� EPR 15 XD 1� 1� 53.15‘‘ 35.91‘‘ 19.88‘‘ 14.37‘‘

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Substation with cabinet EPR 6 SD.., EPR 9 SD.., EPR 1� SD.., EPR 15 SD..

Dimensional drawing of the Laing Electrically heated substation

Substation with mounting bracketsEPR 6 XD.., EPR 9XD.., EPR 1� XD.., EPR 15 XD..



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Manifold Design and Valve Characteristics

Integratedflowmeterforarange of 0.0044 to 0.018 GPM.Withflowadjuster

Valve for manual shutoff integrated in the mani-fold

Glassfiberreinforcedpla-stic, corrosion resistant and resistant to aging, temperature resistant up to �75°F

Integrated universal adap-ter for Copper, Plastic and soft steel Tube from 0.39‘‘ to 0.85‘‘ diameter.

CompressionfittingwithO-ring

Double walled manifold with air pocket for insulation



Electrically heated central substation - Model EPR Z

Design of the Laing Electrically heated central substation

The use of the central substation is preferable whe-never there is not enough room for a substation with manifolds or when the radiator heating is done in a single loop.The central substation can be installed in the utility

room or, because of its whisper-quiet operation, even in the living quarters. Due to its compact size the central substation can be placed in a small recess.

Approx. �.36‘‘di-stance between the wall and the Electric heater-circulator unit for thermal insula-tion.

Pressure relief valve, air purger, pressure gauge and thermo-meter

Electronic Micropro-cessor control with constant temperature control and safety functions

Plumbing connec-tions of the Electric heater-circulator unit withunionfittingsandball valves

Corrosion resistant pressurized expan-sion tank

Whisper-quiet Laing spher i ca l mo to r pump



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Available Models and dimensions of Laing Electrically heated Central Substations

Central Substation with Electric heater-circulator unit EPR 6, EPR 9, EPR 1� or EPR 15 include corrosion resistant pressurized expansion tank (6 l), pressure

gauge, safety relief valve, thermometer, shut-off val-ves, fully assembled and factory tested for leaks.

Model Dimension A Dimension B

EPR 6 Z 11.81‘‘ �4.33‘‘

EPR 9 Z 11.81‘‘ �4.33‘‘

EPR 1� Z 14.37‘‘ �6.89‘‘

EPR 15 Z 14.37‘‘ �6.89‘‘



Electric single room heater - Model EHR 2

Wiring Diagram of EHR 2 KR

DescriptionThe electric heater Model EHR � consists of an elec-trical heater, a Laing spherical motor pump and an electric control. The whisper-quiet spherical motor pump draws water from the return side and pumps the water past the electric heating elements to the feed side. The Electric heater-circulator unit contains a safety temperature limiter as well as an integrated constant temperature thermostat. Optionally an integrated timer with daily or weekly programming is available. All parts of the Electric heater-circulator unit coming into contact with the liquid are corrosion resistant so that the unit can be used for domestic hot water as well as in heating loops.

ApplicationsDue to its compact design (depth only 3.15‘‘), its quiet operation and the integrated controls, the Electric heater-circulator unit EHR � can be used for single room heating without any problems.

Dimensional drawing of EHR 2

Technical SpecificationsPump Laing spherical motor pump model A1-150, �30V, �5W

Connection R 1/�“ female thread

Heating Capacity 1 heating element of �000 W

Controls Safety temperature limiter (�03°F), constant temperature thermostat with a range of 68°F to 178°F, timer with daily or weekly program to control the heating times.

Pump Performance Curve

Available Models

EHR � KR Electric heater with circulator, safety temperature limiter and constant temperature thermo-stat.

EHR � KRU Electric heater with circulator, safety temperature limiter, con-stant temperature thermostat and timer with daily program.

EHR � KRUW Electric heater with circulator, sa-fety temperature limi-ter,constant temperature thermostat and

Pum

p

Temperature controller

Temperature

setting

T w

ater

Heating element

3.07’’ 6.69’’

1.61’’

8.44

’’6.

50’’

Min

. 1.5

7’’

2.01’’

16.7

3’’

0

1

2

3

4

5

0 1 2 3 4 5

Pum

p he

ad [f

t]

Flow rate [GPM]



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Electric single room heater with cabinet - Model EHR 2 S

S a f e t y tempera-ture limiter with con-stant tem-perature control

Filling and drainingfittings

Manifold for two loops

Galvanized steel cabinet


DescriptionThe electric single room heater with cabinet EHR � S consists of an Electric heater-circulator unit EHR � with an electric heating capacity of � kW, feed and returnlinemanifoldsfortwoloops,fillinganddrainingfittingsandapressurelessexpansion tankwithfillheight indicator. All components are assembled in a galvanized steel cabinet for mounting inside a wall. The pressureless expansion tank ensures optimal air purging for the whole system and renders the safety valve and pressure gauge unnecessary. The completely assembled unit reduces the instal-lation expense to a minimum. The unit can be placed inside a recess and requires only the electrical and pipe connections.

ApplicationsThe single room heater with cabinet EHR � S is ap-plicable wherever heating independent from a central heating system is required. Such applications need a separate expansion tank. Due to its compact design the unit can be placed almost anywhere without a problem. Attention must be paid to the fact that the unit has to be placed above the heating loops due to the pressureless expansion tank. It is even possible to place the unit inside an 4.33‘‘ thick wall. Due to the whisper-quiet operation of the spherical motor pump, the unit can be installed inside rooms. The integrated control elements allow the room tem-perature to be controlled with just an additional room thermostat such as our RT or RTU.

Technical DataElectric single room heater EHR � KR/KRU/KRWUManifold Brass manifold 3/4“, � portsExpansion tank Pressureless with integra-

ted air purger, volume approx. � l

Cabinet Galvanized steel cabinet, Height: From �6.77‘‘ to �9.13‘‘ Width: �6.6�‘‘ Depth: From 4.53‘‘ to 6.69‘‘

Available Models EHR � KRS Electric heater with circulator EHR

� KR, with constant temperature control, pressureless expansion tank and cabinet.

EHR � KRUS Electric heater with circulator EHR � KRU, with constant temperature control, pressureless expansion tank, cabinet and timer with daily program to run the unit only during preset hours of the day.

EHR � KRUWS Electric heater with circulator EHR � KRU, with constant temperature control, pressureless expansion tank, cabinet and timer with weekly program to run the unit only during preset hours of the week.

Pressureless expansion tank withfillheightindicator.

Schematic Drawing



Aside from the constant temperature controls integrated in the Laing Electric heater-circulator units, there is a large number of controls available for every need. The components are carefully matched.

Controls for Laing Electric heater-circulator units

Suitable for Description Model EPR EHR �Temperature control depending on outside temperaturewith analog clock and optional room AR 1000 a

temperature sensor Room temperature controlsRoom thermostat RTS

Room thermostat with timer RTU

Constant temperature controlIncluded as standard in EPR and EHR � Spare partsReplacement safety temperature limiter STBR

Main printed circuit board for EPR EPRT

Processor printed circuit board for EPR EPRH

Components Analog control unit AR 1000 Ra

Outdoor temperature sensor AFa

Feed temperature sensor VFa

Room thermostat RTZ

Room thermostat with timer RTU

Thermoelectric actuator for �30 V TEA

Terminal box KK

Zone connection module ZM1�Pump shutdown module ZRPThermolelectrive drive TEARoom thermostat with nighttime setback RTR



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Accessories and replacement parts for Laing Electric heater-circulator units

Model Description

A1-150A1-150 UA1-150 WLF 400A5-400A6-600

Replacement pump EHR � KR Replacement pump EHR � KRU Replacement pump EHR � KRUW Replacement pump for EP and EPR 6/9/1�/15 (without switch/external capacitor)Standard Replacement pump for EPR 6/9/1�/15, Power consumption 99 WReplacement pump for EPR 6/9/1�/15, Power consumption 130 W

VSVAVSRAD180D�50HDG

DXG

AEB 1“KVER KKVER KKVER KKVER KKVER KKVER KKVER SKVER MTH14DG6SV �,5MA �,5DGS6STBREPRTEPRHEPRWHEPMHTHMABWAS �0

MUV �0LAM � R

Flush-mounting cabinet (galvanised sheet metal) for...Cabinet ACabinet BS4 - BM1

ManifoldsegmentfeedwithvalveforfloorheatingManifoldsegmentreturnwithflowmeterforfloorheatingFlow meter insert for VSRA, green, measurement range 0.13 - 0.78 GPM Flow meter insert for VSRA, red, measurement range 0.�6 - 1.10 GPMConnection set for EPR (2ballvalves1“femalethreadwithunionconnectionwithflatgasket)Duplex connector, feedandreturnmanifoldwith2loopsforFH2,withoutcompressionfittingModelKV(K/S/M)1“ Connector for the right end of manifoldCompressionfittingforplastictubing0.41‘‘x0.05‘‘(10,5x1,25mm(Polytherm))Compressionfittingforplastictubing0.55‘‘x0.08‘‘(14x2mm)Compressionfittingforplastictubing0.63‘‘x0.08‘‘(16x2mm)Compressionfittingforplastictubing0.67‘‘x0.08‘‘(17x2mm)Compressionfittingforplastictubing0.71‘‘x0.08‘‘(18x2mm)Compressionfittingforplastictubing0.79‘‘x0.08‘‘(20x2mm)Compressionfittingforcopper-/steeltubingø0.59‘‘(ø15mm)Compr.fittingformeatll-/plastictubing0.63‘‘x0.08‘‘(16x2mm)ThermometerPressurized expansion tank (1.6 Gallons, corrosion resistant, static pressure10.9 PSI)Safety valve R 1/�“, 36.3 PSIPress. gauge 36.3 PSI, R 1/4“, connect. bottom-upKit with expansion tank, safety valve, pressure gauge, automatic air purger and accessoriesReplacement for EPR safety temperature limiterTriac-assemly EPRMain PC board for EPR and EPR Z Main PC board for EPR WMain PC board for EPMCombination Thermometer/pressure gauge for EPRWConnection set (DN 15) for storage tank heater, consisting of overriding control LAM � R, storage tank sensor TF3 and motorized three way valve MUV 15Motorized three way valve DN 15 (�30 V/50 Hz)mDomestic water priority control device (setting range 68-167°F) with switch (without connection cable)

EPR - W 39.37‘‘ x H 39.37‘‘ x D 4.33‘‘-6.69‘‘ EPR - W 5�.36‘‘ x H 39.37‘‘ x D 4.33‘‘-6.69‘‘ EHR � B with adjustable door for wall and tilesW 13.58‘‘ x H 31.50‘‘- 34.�5‘‘ x D 4.�6‘‘-6.89‘‘

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About us

Since the 1950s we at Laing have worked in the areas of research, development and production of pumps and heating products. More than 1000 patents worldwide resulted from this work. The original R&D institute located in Southern Germany has over the years evolved into an international company with additional locations in the US, Japan and Hungary and with more than 400 employees. Today, our program consists of:

Pumps (Shaftless spherical motor pumps) Heating controls Floor heating system connection Electrical heaters Special products

Weareaflexibleandcompetentpartnerintheareaofpumpingandheating.We invite you to try our high quality, economic products.

Laing Thermotech, Inc. · 830 Bay Blvd. Ste #101 · Chula Vista, CA 91911 · USAPhone: (619) 575 - 7466 · Fax: (619) 575 - �739 · E-Mail: [email protected] · Internet: www.lainginc.com

Laing Electric Heater-circulator

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