Towel Warmers

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Revision: November 2019

What does Merriott stand for?Merriott offers bespoke heating and cooling solutions that are the better choice for commercial applications across the UK and Ireland.

This means investing in world-class production facilities, and manufacturing products of the very highest standard – backed by revolutionary technology, rigorous testing and stringent quality control.

As a company, we have an unwavering commitment to innovation and sustainability, pioneering products that lead the way in design, performance and energy efficiency.

Underpinning all of this is our relationship with our customers: ensuring they can rely on best-in-class service and support, from specification right through to delivery.

Content

Model Options 03

Range Overview 02

08Correction Factors

07Features & Options

09Resistance Diagram

Heat Outputs And Data Charts 04-06

02

Product DescriptionMerriott Towel Warmers offer outputs from 200 Watts to 1400 Watts at ΔT50˚C.

The range is formed of the Edge and Groove towel radiators, the Crystal towel warmer & Crystal E which is an electric only towel warmer.

Outputs All Merriott radiators are manufactured and tested in accordance with BS EN 442.

Finish Every Merriott Towel Warmer undergoes an intensive pre-treatment process to protect against rust. In pre-treatment, the radiators are degreased, coated with iron phosphate and rinsed prior to painting. A cathodic electrodeposition primer coating is then applied to give total coverage of the bare steel and maximum corrosion protection. The durable topcoat (epoxy polyester powder) is electrostatically applied and stove enamel baked at 180˚C. The process is monitored to ensure continuous achievement of optimum adhesion, opacity and gloss levels.

Colour The standard finish for the Edge and Groove is semi-gloss RAL 9016 (white) in epoxy polyester powder. The Crystal towel warmers are available in chrome and white.

All chrome towel warmers are polished to a high quality finish.

Range OverviewPackaging The entire surface of the towel warmers, including all 4 corners, is protected by cardboard box ends and packed in shrink wrapped polythene.

ConnectionsStandard connections on all towel warmers are 4 x 1/2" (15mm) BSP connections at E, F, G and H.

TestingEach towel warmer is tested to 1.3 times its maximum allowable working pressure. The maximum allowable working pressure for all bathroom radiators is 5.38 Bar

Dimensional Tolerances Dimensional tolerances are in accordance with BS EN442.

Electric Power Option (Dual Fuel)All towel warmers can be fitted with an electrical element and can be used when the central heating is not in use. This enables users to have warm dry towels without heating the rest of the house.

Warranty Merriott towel warmers are guaranteed for a period of 10 years from date of purchase in respect of defective materials and workmanship. In respect of the electrical componentry forming part of electrified radiators and towel warmers, these are guaranteed for a period of 2 years. The system should be designed in accordance with British Standard Code of  Practice for Water Based Heating Systems in Buildings BS EN 12828:2012+A1:2014 and BS EN 12831: 2003. The installation and commissioning of the system should comply with BS EN 14336:2004. On completion of the installation, the system should be properly flushed and filled in accordance with the British Code of Practice for the Treatment of Water in Domestic Hot Water Central Heating Systems BS 7593:2006, Part L of Building Regulations and Good Practice Guidance for Scotland. Merriott strongly recommends the use of corrosion inhibitor for all applications. Failure to observe these standards may invalidate the manufacturer’s warranty.

03

SANREMO dritto - h 690 SANREMO straight - h 690 SANREMO gerade - h 690

Code: SANREMO DR h 690

QRL Radiator Group, Imperial Park, Celtic Way, Newport NP10 8FSTel. : +44 (0) 1633 657081 Fax. : +44 (0) 1633 681864

SURFACE TEXTURE IN MICROMETERSREMOVE SHARP EDGESTOLERANCES EXCEPT WHEREOTHERWISE STATEDDIMENSIONAL 0.2 ANGULAR 1

ISS Modification App'd DateChg'd

This drawing is confidential and is not to be disclosed to any third party without written permission of Quinn Radiators Limited PROJECTION

DateApprovedCheckedDrawn

Drg. No. Iss.Material :IF IN DOUBT ASK!DO NOT SCALE Title :

ALL DIMENSIONS IN MILLIMETRES

ScaleMAKING PEOPLE WARMER

RADIATOR GROUP

SANREMO curvo - h 690 SANREMO curved - h 690 SANREMO gebogen - h 690

Code: SANREMO cv h 690

CRYSTAL CURVED Available in both white and chrome

3 x Heights: 690mm, 1230mm, 1703mm

2 x Widths: 450mm, 600mm

CRYSTAL STRAIGHT Available in both white and chrome

3 x Heights: 690mm, 1230mm, 1703mm

2 x Widths: 450mm, 600mm

CRYSTAL E STRAIGHT & CURVEDAvailable in both white and chrome

4 x Heights: 720mm, 920mm, 1375mm, 1703mm

3 x Widths: 400mm, 480mm, 550mm

Model Options

EDGEAvailable in RAL 9016 (white) as standard. Other RAL and BS colours available

3 x Heights: 800mm, 1200mm and 1800mm

3 x Widths: 500mm, 600mm, 750 mm

GROOVEAvailable in RAL 9016 (white) as standard. Other RAL and BS colours available

3 x Heights: 800mm, 1200mm and 1800mm

3 x Widths: 500mm, 600mm, 750 mm

04

EDGE

Height 800mm 1200mm 1800mm

Width 500 600 750 500 600 750 500 600 750Dry weight (kgs) 9.3 10.7 12.9 13.8 16 19.3 22 25.6 30.9

Water content (l) 3.3 3.6 4 4.8 5.2 6 7.7 8.5 9.8

Number of elements 16 16 16 24 24 24 39 39 39

Output (Watts) Output (Watts) Output (Watts)

ΔT50 434 504 609 628 733 890 1005 1172 1423

110

60

WIDTH

LENGTH - 40

GROOVE

Height 800mm 1200mm 1800mm

Width 500 600 750 500 600 750 500 600 750Dry weight (kgs) 9 10.4 12.6 13.1 15.7 18.9 20.8 24 30

Water content (l) 3.6 4 4.6 5.4 6 6.9 8.1 9 10.5

Number of elements 16 16 16 24 24 24 37 37 37

Output (Watts) Output (Watts) Output (Watts)

ΔT50 393 463 569 579 684 841 888 1044 1279

100 100

82

40

WIDTH

LENGTH - 40

Note: To be used only on an indirect or closed heating system

Heat Outputs & Data ChartsEdge & Groove

Recommended Electrical Element for Edge & GrooveHeight 800 1200 1800

All widths 200 Watt 300 Watt 300 Watt

Part Number EE002 EE003 EE003

Groove

Edge

05

Height 690mm 1230mm 1703mm

Width 450 600 450 600 600

Dry weight (kgs) 5.1 6.2 10.1 11.3 - 15.4

Water content (l) 2.9 3.6 5.6 6.8 - 9.0

Number of elements 14 14 25 25 - 35

WHITE Output (Watts)

Output (Watts)

Output (Watts)

ΔT50 301 386 522 669 - 940

Crystal Curved

SANREMO curvo - h 690 SANREMO curved - h 690 SANREMO gebogen - h 690

Code: SANREMO cv h 690

Height 690mm 1230mm 1703mm

Width 450 600 450 600 600

Dry weight (kgs) 5.1 6.2 10.1 11.3 - 15.4

Water content (l) 2.9 3.6 5.6 6.8 - 9.0

Number of elements 14 14 25 25 - 35

WHITE Output (Watts)

Output (Watts)

Output (Watts)

ΔT50 301 386 522 669 - 940

Crystal Straight

Recommended Electrical Element for Crystal

Radiator HeightElement Order

Part NumberOutput Watts

All Heights EE002 200

CHROME 690mm 1230mm 1703mm

Output (Watts)

Output (Watts)

Output (Watts)

ΔT50 195 251 356 464 - 644

SANREMO dritto - h 690 SANREMO straight - h 690 SANREMO gerade - h 690

Code: SANREMO DR h 690

CHROME 690mm 1230mm 1703mm

Output (Watts)

Output (Watts)

Output (Watts)

ΔT50 195 251 356 464 - 644

Heat Outputs & Data ChartsCrystal Straight & Crystal Curved

06

Height 720mm 920mm 1375mm 1703mm

Width 400 480 480 550

Number of elements 13 18 27 33

Dry weight (kgs) 7.7 9.4 14.7 24.1

WHITE Output (Watts)

Output (Watts)

Output (Watts)

Output (Watts)

ΔT50 300* 500 750 1000

CHROME 720mm 920mm 1375mm 1703mm

Output (Watts)

Output (Watts)

Output (Watts)

Output (Watts)

ΔT50 200* 300 500 750

Crystal E Straight

Heat Outputs & Data ChartsCrystal E

*not available as a curve modelSizes also available without controller for contract use.

h 720

TUBES: 13

h 920

TUBES: 18 TUBES: 27

h 1375

TUBES: 33

h 1703

DRITTO - STRAIGHT - GERADE

3x

3x

1 2

3 4

1x

85/95 mm

65/80 mm

40 mm40 mmU0615356Rev 1 - 17-10-17

h i-m

h i-m690 492803 6151110 9021230 10251420 12301703 1517

VALIDO PER TUTTE LE MISUREVALID FOR ALL SIZES

GÜLTIG FÜR ALLE ABMESSUNGEN

5

a

b

200mm

07

Dip Tubes Standard connections on all towel warmers are 4 x 1/2" (15mm) connections at E, F, G and H. Normal application means the towel warmer is connected up at the E and F connection, with 2 x 1/2" (15mm) airvents at the G and H locations. It is possible, using a dip tube, to pipe up the unit from the top (i.e. at G and H) to ensure overall water distribution. These can be inserted into the product or can be retrofit if required.

Features & Options

Dual Adaptor Kit (Does not apply to Crystal E)This consists of an electric element and a T-Piece (illustrated below) and can be used on all towel warmers to achieve heat when the central heating is not being used, during summer months for example.

Dual Adaptor Kits can be retrofitted if necessary. The size of electric element will depend on the size of the towel warmer itself. For more information on sizing, please contact the Merriott Sales Office.

Fig.1 Fig.2

19

15

Connection Ladder

Connection sizes available 1/2" (15mm)3/4" (20 mm)1" (25mm)

G H

E FB D

A C

08

The outputs quoted in this brochure are based on a Δ T of 50˚C.

Listed below are the multiplying factors needed to calculate the output at other Delta Ts (ΔTs) between 20˚C and 60˚C. This is done by multiplying your heat output with the appropriate correction factor selected from the table below. Please note more detailed correction factors for towel warmers are available from your local Merriott contact.

EXAMPLE:Required Room Temperature = 21˚C, Flow Temperature = 86˚C, Return Temperature = 72˚C

SOLUTION:Mean Water Temperature = (T Flow+T Return)/2 = (86 +72)/2 = 79˚C

ΔT = Mean Water Temperature - Required Room Temperature = 79 -21 = 58˚C

From the tables below, the output for the towel warmer at ΔT58˚C is 1.1984 times the output stated at ΔT50˚C.

Correction Factors

ΔT(˚C) Based on ΔT50 ΔT(˚C) Based on ΔT5020 0.3272 41 0.7851

21 0.3472 42 0.8085

22 0.3675 43 0.832

23 0.3879 44 0.8557

24 0.4086 45 0.8794

25 0.4295 46 0.9033

26 0.4505 47 0.9273

27 0.4717 48 0.9514

28 0.4931 49 0.9757

29 0.5147 50 1

30 0.5364 51 1.0244

31 0.5583 52 1.049

32 0.5803 53 1.0736

33 0.6025 54 1.0984

34 0.6248 55 1.1232

35 0.6473 56 1.1482

36 0.6699 57 1.1732

37 0.6927 58 1.1984

38 0.7156 59 1.2236

39 0.7386 60 1.249

40 0.7618

09

How to calculate the resistance of a Towel Warmer at ΔT 50˚C

Towel Warmer Type: Crystal Straight 1160mm LONG x 600mm HIGH

Output @ ΔT 50˚C: 643W (flow/return – 75/65˚C)

If the output is not at ΔT50˚C, please use the correction factor table on the previous page to get the correct output.

C – Specific Heat Constant (always 4187 J/kg˚C)

Q – (m) x (C) x (ΔT)

Output – (flow rate) x (Constant) x (difference between flow and return temp)

Watts – (l/s) (J/kg˚C) (˚C)

643 – (m) (4187) (10)

Therefore

m – 643 / ((4187) x (10))

m – 0.0153570 (L/S)

x 3600 (L/H)

m – 55.2852 L/H

Please refer to the resistance diagram which gives a value of approx 9.5m Bar.

ResistancePr

essu

re D

rop

ΔPW

(mBa

r)

Flowrate Vw (l/hr)

10

Notes

11

Contact detailsMerriott UK & Ireland Purmo Group (UK) Ltd, Eastern Avenue, Team Valley,Gateshead, Tyne & Wear, NE11 0PGTel: 0330 0415 472

sales@merriottuk.comsales@merriott.ie

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