DIYbanter - View Single Post - Combi boilers, electric showers etc. revisited

RJH[_2_]

On 28/04/2019 14:48, wrote:
On Sunday, 28 April 2019 13:36:27 UTC+1, David WE Roberts (Google) wrote:
(1) The maximum power output of a UK electric shower is around 10 kW. The
output of a small(ish) combi boiler is around 28 kW. So the combi should
be able to apply 2.8 times the heat to incoming cold water and so (I
assume) heat 2.8 times the amount of incoming water to an acceptable
temperature compared to the electric shower.

Yes.

(2) Electricity costs around 3 times gas (per unit of energy) which kind
of balances out. You can either have about 3 times the hot water in your
shower for the same price or save money each time you shower at lower flow
rates.

Yes.

I think most people would go for the more satisfying shower which does
reduce/eliminate the cost saving from using a combi boiler.

Possibly, but the saving is only eliminated if you are using 3x the heat. You might in winter, but for the rest of the year only use 2x the heat. That would be a better shower than electric, and still a bit cheaper.

Also, and having experienced this for the past few years, it takes a lot
longer to perform the rinse cycle from the electric shower's dribble.

--
Cheers, Rob