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How about a small 2 storey extension to the side of the kitchen and upstairs bathroom. You can then have a larger kitchen and an upstairs shower room. You would need to make a corridor from the landing along the side of bedroom 2 to gain access. The cost of the extension would likely be less...

The problem with not heating rooms whilst heating others is that the radiators that are heating will have to work harder due to the unheated rooms absorbing heat. Unless the unheated room is isolated from the rest of the house meaning doors closed and insulated plus walls and floor insulated...

What is the minimum your boiler will modulate down too? Mine is a little over 7.2kW which means I have to have most radiators on to prevent short cycling of the boiler.

I have a Drayton Wiser setup with daytime set to 20c and overnight set to 17c. The house very rarely drops to below 17c overnight but I was finding that certain radiators with smart TRV's were registering lower temperatures overnight and calling for heat unnecessarily (the hall and kitchen). I...

I think smart TRV’s can work in certain situations but are not a solution for everyone. They certainly haven’t worked for me and since removing most of them and going back to manual TRV’s on most radiators my gas usage has decreased and my comfort has increased.

Let's us know how you get on.

Just a thought but what is the boiler flow temperature set to? Don't have it higher than 65c.

Also turn off "early start" and see if that also improves gas usage, I have a similar mode on my Wiser system called "comfort mode" but it just wastes gas IMO.

So you keep your study radiator heated all day and all other radiators are off?

Gotcha but I was referring to how smart TRV's are able to call for heat individually just to heat their radiator and no others.

But your Octopus gas usage suggests that something is turning your boiler on periodically all day long. How have you setup the heating schedules in Tado?

How have you come to that conclusion? I have a lovely warm house with all radiators heating up in unison.

I used to have smart TRV's on all my radiators, I have now removed nearly all of them. It makes no sense heating a room at a time.

That looks like your smart TRV's are calling for heat all day long!

I would ignore what Tado says, estimating and averaging is bound to give incorrect information.

Where does Tado get its information from?

I live in a large 4 bed house built in 1996 in the south of England and our gas usage for December was just over 1900kWh so I think you have an issue at 5000kWh usage. From what you have said there is no gas usage when the boiler is off so there must be an issue with the boiler setup.

I went with Loftzone because the system is a lot lighter than using timber and more stable than using loft legs alone. Timber adds a lot of extra weight to the loft floor.

It depends on the heat loss of the rooms and how low the boiler will modulate down too.

If too many radiators are off the boiler will short cycle likely resulting in higher energy usage than just leaving the radiators on.