Pre heat hot water

Cardew

r2015 wrote: »

Can you offer an other explanation then?

No - not at all.

Leaking hot water tap somewhere?

How often, and for how long does the boiler fire for, (when the heating is off) and pre-heat is on?

Edit.
Faulty boiler where HW tank is overflowing into a drain??

In any case I would contact boiler manufacturer for an explanation of your problem.

jelliot

We normally have the preheat timed to come on during the day as we use a lot of hot water.

I went on holiday for 12 days and when I came back 8 m3 units (90kWh) of gas had been used.

I had thought that even although the heating was set to 12 deg C it had got cold enough for the heating to come on.

This was at the beginning of October.

Now I know that it was the pre heat function, which I have now switched off and am using at least 11 kWh of gas less a day.

r2015

In any case I would contact boiler manufacturer for an explanation of your problem.

I contacted the installer and he said that is why he turns the pre heat off.

Also not to let my wife do the dishes as she was probably rinsing the dishes in hot water.