Our heating regime:
During the day, the upstairs rads are either off or on very, low. The bathroom rad is on all day. Downstairs, the hall, lounge and kitchen/diner are on all day and the downstairs loo is on low. After we have had our evening meal and move into the lounge, I turn both double rads in the kitchen/diner off. Around 9.30 in the evening I turn our bedroom rad and the upstairs landing rad on and when the heating goes off at 10.00, I boost the heating for 30 mins while I have my shower - I do like a warm bedroom to go into but not to wake up to so I turn that rad off when I go to bed and turn the rad on in the other bedroom on so that it warms up when the heating comes on at 5.30 as Mrs Mottie gets up at 6.00 for work on three days per week and gets dressed and puts her slap on in there. She turns it off when she’s finished. Hot water is on 24/7. I have our 18Kw boiler set to 14kw with a flow temperature of 62° and all our rads except the one in the lounge have TRV's. We have an insulated loft plus that fluffy insulation in the cavity walls.
We are lucky that we took out a new two year fix in Oct '21 just before the proverbial hit the fan and prices rocketed. We'll certainly notice it when it ends next October!
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