On 20/05/2017 21:47, Harry Bloomfield wrote:
The Natural Philosopher wrote on 20/05/2017 :
work out how big a combi needs to be to say dump 400 litres a minute
of water at 60 degrees

then work out how much more expensive that is than a small boiler with
a mains pressure hot water tank

then do the sensible thng

For someone in at irregular times, where a timer cannot be set and who
doesn't mind waiting for the hot water to appear very slowly,

Combis with pre-tempered water stores, don't suffer the delay problem so
much.

they are
fine. For everyone else, who wants a bath filled rapidly, who might need
to run two taps at the same time - stored hot water.

Bath filling will be more of a challenge - when you work out the
equivalent heating rate required to match a cylinder you will often
arrive at 100kW or more, and you are not going to be able to suck that
much gas through a domestic meter!


--
Cheers,

John.

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