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Need new boiler - options confusing
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As for the cats.....could you teach them how to open doors? Some cats can and that at least would let you heat some areas more efficiently. And rather than get rid, why not get more? The more cats, the more heat generated and you can use them as a live duvet for when you're sitting watching tv etc.
2023 £1 a day £54.26/365
If you delay your upgrade and insulation until then, you'll wait forever. Surely now is the time to invest in insulation and more efficient heating, as it is at it's most cost-effective when prices are high?.
I found that my Edwardian mid-terrace settles ~11-12C if I turn my heating off for several average days at this time of year, presumably from heat transfer via party walls.
Similar to you, my kitchen has a solid floor & overnight is the coldest room in the house (it also has 2 external walls) but does benefit from solar gain during the day.
By not heating your house at all you may be causing hidden damage (interstitial condensation).
If you have the budget I would review your heating system from scratch* especially if your radiators are as old as your boiler.
The rad sizes/styles will have been chosen based on a higher design flow temp than is now the norm for efficient running of a condensing boiler.
Your old rads will need at least some form of flush for the boiler warranty.
How long do you intend to be in this property? Looking forward, the next replacement cycle (15 years?) is likely to be a heat pump & involve stored hot water (a tank) so if you are going to be replacing rads then it makes sense to consider suitability for that (& also pipe sizes) .
If you can afford it I agree with macman that now is a good time to invest in insulation & efficient heating. With higher prices the no. of years for improvements to break even or move into profit reduces. & as you get older you are only going to feel cold even more.
* don't forget modern controls in this - they can make a significant difference to consumption
Treasure the moments that you have. Savour them for as long as you can for they will never come back again.
We are talking about someone that instead of setting at budget of say £6-8, That would give 3 or 4 hrs a day went all #Hertslad
But replacing the boiler is still the fastest payback, even if prices drop in 2 years.
On a properly sized heating system, the boiler return flow temperature must be below 56c. The lower the temperature, the higher the boiler efficiency. I run my system boiler at flow temperature of 55C.