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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.

Have you manually opened the CH zone valve? If so that is why you now get CH heat when the HW demands it.

You said you disconnected the old thermostat wiring from the honeywell wiring centre, the terminals you disconnected the wires from will need to be connected together.

You can not just disconnect the thermostat as you will leave the heating open circuit. In the wiring centre loop the 2 connections together where the thermostat wires were terminated.

I used loftzone...

That sounds odd to me. If the towel rail is on the secondary return then it will only heat up when a hot tap is turned on. As you say off topic so enough said.

I know that. :) Why would you have a radiator/towel rail on the HW circuit?