Advice needed for very old house

FreeBear

QrizB said: If you don't know the rads ratings, it's fairly straightforward to measure them, look at their design (one panel or two, fins or not) then find a similar rad at eg. Screwfix or Toolstation and work it out.

This site is as good as any - http://www.simplifydiy.com/plumbing-and-heating/radiators/power - Covers common sizes, and for anything in between, it is easy enough to extrapolate.

theoretica

Are you in an area of similar houses?  One thing you might do is compare notes with a neighbour - and just look at their vents to see how much their boilers are running.

markin

MultiFuelBurner said:

It's been -2oC here all day and although not gas out heat pump has been running constantly 

We will use about 36kwh today due to the temp outside and that's in a modern EPC B house and we won't be turning it off overnight or setting a min temp or 14oC.

You probably need to go through the pain of heating the fabric or the house up fully and not setting the heating back so much overnight as you will always be playing catch-up.

At a COP of 3 that would be around 108 kwh ?  


OP, if your house is solid brick wall i would say about 3 days to start reducing gas use.

If you leave a house off for 4 days when away it will use double the energy for 3-5 days when you get back and try to re heat it.

 The 2 hrs in the morning and 2-3 hrs in the evening simply doesn't work in a high mass, no insulation house.

MultiFuelBurner

markin said:

MultiFuelBurner said:

It's been -2oC here all day and although not gas out heat pump has been running constantly 

We will use about 36kwh today due to the temp outside and that's in a modern EPC B house and we won't be turning it off overnight or setting a min temp or 14oC.

You probably need to go through the pain of heating the fabric or the house up fully and not setting the heating back so much overnight as you will always be playing catch-up.

At a COP of 3 that would be around 108 kwh ?  


OP, if your house is solid brick wall i would say about 3 days to start reducing gas use.

If you leave a house off for 4 days when away it will use double the energy for 3-5 days when you get back and try to re heat it.

 The 2 hrs in the morning and 2-3 hrs in the evening simply doesn't work in a high mass, no insulation house.

I had a quick look at the spec sheets and an outside temp -2oC with a flow of 35oC on our heat pump should be 2.9 so not bad considering.

Sadly we don't have an option for that on ours to view. I have contacted Mitsubishi and they may have a WiFi controller and Mel cloud system we can look into but it appears to be £300 installed which wouldn't bring us much benefit.

The reason for the big energy use is we were out Friday and like fool I turned.the heat pump off whilst out from 7am onwards and we returned during the DFS event. It then took all that power yesterday to get us where we are today 20-21oC everywhere.

That said we will have saved circa £8 on the session and on tracker yesterday's heating and everything electric came to £9 and we also used very little Friday due to me turning the heating off.

And for those that have a passing interest the fact we used less electricity on Friday when it was 25.37p kWh come the end of 2nd December our spreadsheet shows an average price of 22p kWh. It's geeky I know but using the lost and shifting it to upcoming cheaper days really can save you money.

vic_sf49

Mine has just been on for 2hrs, and raised the temp by 2.2 degrees, according to my Hive thermostat.

It's dropped into the 14s overnight, from approx 20 dgrees at 5pm.

Detached bungalow. Epc B (91 points). Good insulation, including cavity wall, except for the solid concrete slab it is built on.

Boiler flow* setting 4.25 (of 1-7) on a Worcester Bosch 28i junior boiler, if my memory serves me correct.

* I ran an experiment last year, and this seemed to be the most efficient setting, that still heated the house fast enough for my liking.

Does your place get up to temp now you've increased the boiler flow temp? 

Sadly, tis the season, for running the central heating a lot.