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Hi Dave I'm not switching the immersion on. That's the point. I only use the programmer. That's why i asked if it might be wired up incorrectly so the immersion kicks in everytime I use the programmer? Thanks Martyn

We moved in June. Heating was off for the majority of the summer. It is the winter bill that has crucified us. We have had numerous conversations with the supplier, even giving readings on a daily basis and switching everything off to see if there are any leaks. They say everything is normal...

So by default, yes, we use the programmer to switch the hot water on and off as we do with the heating.

I don't know if this helps, but the immersion switch in the cupboard where the cylinder is housed is never switched on

Sorry for the confusion, to be perfectly honest, I don't know. I don't have any manuals, is there any obvious way I can tell? Thanks (btw, you may have guessed by now that I'm not overly technical) Martyn

We have an immersion switch near the cylinder which is housed in a cupboard on the 1st floor. In the same cupboard we have the electronic timer/programmer for both hot water and central heating (they can be programmed individually). The gas boiler is on the ground floor in the utility room.

Hi Dave We don't have a water tank anywhere which is why I think it's direct. Is there a sure fire way for me to tell? Martyn

Hi all This is my first post, so apologies if my etiquette is poor! We recently moved to a new home and we have a Heatrae Sadia Megaflo unvented direct feed hot water cylinder and a gas boiler. We recently received a bill for the gas and electric which was nearly £1000! The split was...