Ronny

Like you i could not get the AI setting to keep the house warm enough. I am now experimenting with it and it comes on in the morning and gets the house up to about 19.5. If i increase the setting to +1 it goes up to 20 deg. My first account from Octopus energy was from the 17th Feb to 8th May. 291 kwh @ 5p and 1304 kwh @ 12.93p Total 1595 kwh. Total cost £203.42 including standing charge of 81 days @ 25p a day. Since just before christmas i have used 2573 kwh`s. Since the end of February it has included cooking as we no longer have gas. It will be interesting to see the costs after a full year. I still think my costs will be close to what it was with the combi, or is that wish full thinking. If it costs more i will still be happy so no problem. You mentioned in a previous post the data logging temp. i have the same readings as you, so i don`t know what this reading refers to. This ex council house was built in 1937 and is insulated as good as possible without spending a fortune to improve it any more. I also like it to be warm as we lived in Africa for nearly 40 years, so are used to the heat. Now i pay for the heat instead of paying to cool the house down. You can`t win.

I am new to buildhub, and have read all 7 pages of this thread, twice as there is so much to digest. I have a 7kw therma v installed via the green home voucher grant. Installed just before christmas so straight into high energy use. I found in the very cold weather, it was easy to burn £6 a day which seemed very high. However now that the weather is warmer the cost is in the region of £1.40 to £1 80. I have also changed to Octopus energy tariff with 5 p a unit for 4 hours in the early morning. I have now timed my hot water to go off at 15.45 so i can take advantage of the cheap rate to heat the water, coming back on at 00.30. I would guess over the year i will be very close to the same running cost as i was with the combi boiler. The gas meter has been removed and an induction stove installed instead of the gas one. This also helps as there is only one standing charge instead of 2. Depending on the daily charge, this can easily save £60 per year. By the way the house is 2 bed ex council about 5 miles from Durham. As i slowly learn how to set the controller i will experiment with various settings, but at the moment anything i have changed has not made any great difference. I have it set at present on Auto (AI) and timed to come on at 07.45. It brings the house up to about 19.5 deg and hardly comes back on all day. Thanks to all for the very interesting thread.