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C O N S T A N T A N D G U A R A N T E E D

D O M E S T I C H O T W A T E R

Energy class A

Efficiency >107% (ex dir. CE 92/42)

Exceptional actual modulation ratio up to 1:8

Domestic hot water production up to 18,3 l/min, with Dt 25, thanks to the special increased heat exchanger which reduces thermal shocks in case of multiple and simultaneous drawing requests

Ultrathin primary heat exchanger in Al/Si/Mg

Electronics with HWS “Hot Water Speed” function

Low NOx class 6 (according to EN 15502-1) thanks to the premix modulating burner

Management of 2 differentiated priority zones (high/low temperature) by applying a second on/off thermostat

High efficiency modulating pump

EASY: remote control (standard) with chronothermostat functions, it can be fitted to the wall or placed on a stand

K+ is the latest generation condensing boiler. In addition to ensuring great heating comfort with low consumption, it guarantees a high and constant instantaneous domestic hot water production. In just 30 seconds, K+ provides users with 11,6 l/minof warm water (40 °C ca. - according to EN 15502).Available in natural gas or LPG version.

Premix modulating burner

Multifunctional gas control with two automatic shut-off valves, servo pressure regulator and pneumatic modulator for proportional control of the gas flow with 1:1 air-gas pressure ratio.

Innovative fan that optimizes the performance and the silence of the air-gas mixer. It is equipped with

an integrated electronic PCB and a patented firmware for the management and mapping

of the engine revolutions.

Seconday heat exchanger

Enhanced for greater temperature stability of domestic hot water and rapid set-up speed. In stainless steel AISI 316L:

with 14 plates (for model 24) with 18 plates (for models 28 & 35)

Especially efficient because equipped with “all active plates”, it is suitable for condensing boilers designed to use low temperature.Thanks to the new “ecological” design of the plates , it allows more heatto be transferred while making the most of its stainless steel features.

HWS “Hot Water Speed”

is the special K+ electronic function that switches from

heating to domestic hot water mode keeping the burner

and pump always active, improving the comfort of the

user who doesn’t have to wait for warm water

Sliding temperature

programmed to operate with the lowest possible flow

temperature to promote energy saving

Anti-overheating post-circulation

Automatically, after switching off the burner, the boiler

keeps the pump running for 5 minutes, preserving the

components

Service function button

allows maintainers to carry out checks in terms of

efficiency and emissions as prescribed by current

regulations

Anti-jaming function

the pump is prevented from locking after long pauses,

thanks to the electronics that launches at the engine,

every 24 hours of rest, an automatic pulse of 5 sec.

“Pit stop” maintenance for technical assistance

interventions

Modulating pump with air vent

High efficiency, in line with the 2015 ErP directive, it automatically sets the boiler

output to the system’s requirements. Particularly silent and compact,

it is integrated with safety valve, by-pass and drain valve.

Modulating premix burner

The “Flat” burner ensures: long duration thanks to the low thermal

and mechanical stresses and to the physical inalterability of the fibre in FeCr alloy

ideal propagation of the radiation heat thanks to its chemical-physical structure able to develop a particularly soft and bright flame

Low NOx class 6 (EN 15502-1) Easy to clean thanks to the

“Quick release” unlocking of the complete plate. The release allows the complete removal of the combustion system.

“Quick release” lock and unlocking

mod. K+ 24C

Exclusive heat exchanger in Al/Si/Mg

It is made of a special Al/Si/Mg alloyWhich ensures a high level of efficiency and resistance so that is guaranteed by Unical for 5 years. Thanks to the internal heat exchanger configuration, efficiency levels exceeding 107% in condensation can be reached, which means that the user has increased cost savings and there is a lower environmental impact.

Fan and gas valve

- compact and silent - wide modulation range 1:8

- absolute safe operation due to the absence of turbulence

The valve is designed to compensate the gas pressure fluctuation

in the mains and to stabilize the supply pressure, regardless of the

suction pressure generated by the premix fan. User friendly and easy to

maintain,it ensures an accurate air/gas mixture combustion

to guarantee high levels of CO2 and help condensation with

extremely low levels of CO and NOx.

Thermoacoustic treatment

up to only 41 dB (Sound pressure level at1 meter away in open field)

Accessories (optional)

A wide range of accessories to complete the system (hydraulic connections, flue ducts, etc.) is available atwww.unical.eu.

Class 5 +3%seasonal energy performance

SIM-CRONO P Backlit weekly modulating remote control with Open Term Protocol

Class 5 +3%seasonal energy performance

REGOLAFACILE ON-OFFWeekly digital chronothermostat ON /OFF

Class 4 +2%seasonal energy performance

K+ CONNECTION COVER KIT

MODULO OTFor multi-zone heating system managementOUTER TEMPERATURE

SENSOR

Class 1 +1%seasonal energy performance

EASY is a wireless modulating weekly thermostat:

with data transmission range of approximately 30 meters

wireless, for weekly / daily remote programming, via App “Total Connect Comfort Europe”, from Smartphone/Tablet

Class 5 +3%seasonal energy performance

RCh Weekly thermostat with Open Therm ProtocolGWAY modulo WI-FI (in combination with RCh)for remote control of the thermostat; via App on smartphones and tablets

700

420345

Technical data according to ErP directive C24 C28 C35

Nominal heat output kW 3,2 ÷ 24 4,7 ÷ 28,9 4,7 ÷ 33,8

Seasonal space heating energy efficiency ηs % 92 93 93

Seasonal EFFICIENCY CLASS in heating mode

Useful heat output in high-temp. regime (Tr 60°C / tm 80°C)) P4 kW 12,7 15,8 18,2

Useful efficiency at nom. heat outputin high-temp. regime (Tr 60°C/ Tm 80°C)

η4 % 87,0 88,0 87,5

Useful heat output at 30% of nom.heat output in low-temp. regime (Tr 30 °C)

P1 kW 4,2 5,3 6,1

Useful efficiency at 30% of nom. heatoutput in low-temp. regime (Tr 30 °C)

η1 % 96,7 97,9 97,5

Emissions of nitrogen oxides rif. PCS NOX mg/kWh 45 50 39

Annual electricity consumption QHE GJ 40 49 56

Declared load profile XL XL XL

Energy efficiency in D.H.W. produc. mode ηWH % 86 85 85

Daily fuel consumption Qfuel kWh 22,07 23,05 23,13

Sound pressure level (*) Lwa db(A) 46 41 42

Seasonal EFFICIENCY CLASS in D.H.W. production mode

Annual electricity consumption AEC kWh 400 402 402

Annual fuel consumption AFC GJ 17 17 18

Domestic Hot Water flow rate (Dt 30 °C) ‘‘D’’ l/min 11,6 13,5 16,5

Production of D.H.W. in cont. operation with Dt 25 K (mixed) l/min 13,2 15,5 18,3

Expansion vessel total capacity l 7 10 10

Maximum production of condensate kg/h 3,7 4,5 5,3

Heating circuit pressure. (min/max) bar 0,5 / 3,0 0,5 / 3,0 0,5 / 3,0

D.H.W. circuit pressure (min/max) bar 0,5 / 6,0 0,5 / 6,0 0,5 / 6,0

Protection degree IP X5D X5D X5D

NOx Class 6 6 6

Net weight kg 40 41 41

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find out more

The K+ product complies with:• Regulation 426/2016 (GAR) - CE marking• Directive 2014/30 / EU (electromagnetic compatibility)• Directive 2014/35 / EU (low voltage)

(*) measured in free field at 1 m distance from the device

www.unical.eu