I have a Hercal coil indirect heater - up to 3 month ago it was
producing enough hot water for all the family to have shower. But
lately it is only enough for one and every time we want to have a
shower I have to put the immersion heater on for an hour or so before
hand.
I keep reading about how boilers work on the internet, it seems to me
that it could be the coil need replacing, but I am not a plumber and
do not like to diagnose it.
Please help me to find the problem and the solution.
Many thank for your kind advice. Fay Clough

In an earlier contribution to this discussion,
Fay Clough wrote:

I have a Hercal coil indirect heater - up to 3 month ago it was
producing enough hot water for all the family to have shower. But
lately it is only enough for one and every time we want to have a
shower I have to put the immersion heater on for an hour or so before
hand.
I keep reading about how boilers work on the internet, it seems to me
that it could be the coil need replacing, but I am not a plumber and
do not like to diagnose it.
Please help me to find the problem and the solution.
Many thank for your kind advice. Fay Clough

Does the boiler also heat the central heating radiators? Is it only since
the heating has been on that you have insufficient hot water? Do you have
timers for HW and CH? If so, long long are they set to come on for each day?
Is there a thermostat on the hot water cylinder (a square box strapped to
the outside of the cylinder - *not* the one in the immersion heater)? If so,
what is it set at?
--
Cheers,
Set Square
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