UK Electric combi boiler

Londontad · May 17, 2024

Hi i have direct unvented cylinder for shower & kitchen tap for hot water
(no radiators). 3 people living .

Wondering is I can change it to electric combo boiler as it’s saving spaces and it’s only shower & kitchen tap.

Not sure what’s requirement ,,
Found this electric combo boiler online but is it suitable ?

https://www.tdlonline.co.uk/docs/Strom/Strom-Electric-Boiler-Brochure-V3.pdf

Or if any recommendations cheaper one but sufficient,,,

It’s an old flat so winder power is sufficient ,, (not using cooker 32A, hob by 3 pin sockets currently )

UNG · May 17, 2024

A combi boiler provides heating as well as instantaneous hot water so are you needing a boiler that does heating

Londontadd · May 17, 2024

UNG said:
A combi boiler provides heating as well as instantaneous hot water so are you needing a boiler that does heating

Yes but I use electric heater . Radiators . Just wanted. To know if the power is sufficient to provide shower and sink with this combo boiler . And my house power is capable of the usage of electricity . ,,,,, in uk people use 3 phase 400V commonly ?

mainline · May 17, 2024

Londontadd said:
Yes but I use electric heater . Radiators . Just wanted. To know if the power is sufficient to provide shower and sink with this combo boiler . And my house power is capable of the usage of electricity . ,,,,, in uk people use 3 phase 400V commonly ?

A Single Phase Combi is possible, For many
people, the flow rate will just not be sufficient
and it will take a long time to fill a bath, for instance.

KungFuTurkeyLeg · May 17, 2024

Electric combi boilers are not as effevtive to heat flowing water compared to gas. I'd only consider an electric combi if you lived in the middle of nowhere with no mains gas supply. As mentioned, it's the flow which lets them down. It would be more effective to get a bigger water tank and run from an immersion with a shower on a pump.

An electric combi can maintain probably ~8 litres a minute flow whilst a gas combi will hit somewhere near 15 litres a minute. I think I had a 40 or 50kw combi fitted at my last house that could maintain 20+ litre a minute, let down only by the 15 litres a minute water supply