Comet Electric Combi Boiler


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The Comet Electric Combi Boiler offers the comfort and convenience of wet central heating and domestic hot water from a single product installation for properties with no access to mains gas. The Comet Combi is the ideal solution for a quick hassel free installation providing heating and mains pressure hot water from within the same product housing. When it comes to electric combi boilers the Comet Combi ticks all the boxes where the performance of a gas combi is required. Due to domstic power supplies in the UK being limited to 100 Amp it is not possible for any electric combi boiler to match the same instantanious hot water performance and flow rates as a gas combi boiler without having some built in storage, therefor the Comet Combi holds a unique internal DHW storage of 144L at up to 30L/min with a rapid reheat time when utialised to supply baths and showers.

If the property has any electric showers installed EHC recommends for an EHC Shower Sensor to be fitted to each shower within the property.


Rated PowerkW91214.4
Rated Voltage V240240240
Load CurrentA39.152.262.6
Fuse Rated CurrentA506380
Min. Permitted Cable Diametermm²101616
Safety ClassIP22IP22IP22
Heating OutputBTU307264096849161
Primary Flow & Return Pipesmm222222
Min Primary Water PressureBar1.01.01.0
Primary Relief Valve PressureBar3.03.03.0
Primary Expansion VesselLitre121212
Primary Expansion Vessel PressureBar1.51.51.5
Max Primary Flow TempºC808080
Min Primary Flow TempºC404040
Overheat ProtectionºC100100100
Max Water Supply PressureBar101010
Cylinder Operating Pressure (Secondary)Bar333
Cylinder operating Pressure (Primary Max)Bar2.52.52.5
Cylinder Operating Pressure (Secondary Max)Bar5.55.55.5
Secondary Relief Valve PressureBar666
DHW TemperatureºC5-665-665-66
DHW CapacityLtr144144144
Temp & Pressure Relief ValveºC95ºC/7 Bar95ºC/7 Bar95ºC/7 Bar
Secondary Expansion VesselLtr121212
Secondary Expansion Vessel PressureBar333
Hot & Cold Connectionsmm222222
Dimensionsmm   1745 x 580 x 630  1745 x 580 x 630  1745 x 580 x 630
Net Weightkg106.8106.8106.8
Gross Weightkg246246246

Note; On systems volumes greater than 120L an additional external expansion vessel will be required.

DHW Recovery Times

Model15ºC to 55ºC15º to 72ºC
9kW44 min62 min
12kW36 min57 min
14.4kW29 min45 min


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