I've got a Vaillant 828 boiler at home, supplying a 4-bedroomed detached house, and it it run off a big LPG tank in the back garden to supply CH and DHW. The LPG bills are enormous and, according to my spreadsheets, uses about 15 litres a day over winter (which was about £4.50 a day last year) and I do not keep my house particularly hot. Don't know how old the boiler is but, if I were going to guess, I would say about 20 years.
There is cavity wall insulation of a sort, kind of fibre-glassy, but when I recently fitted a tumble-dryer duct, there does not appear to be a great deal of it. Whether this is because it has all settled down the bottom or something I don't know, but it was decidedly wispy.
Is there any rule of thumb to tell me, based on the skimpy info above, how much money I could save by going for a more efficient boiler so I can work out how long it would pay back over. Is a solid-fuel granules boiler a better option, or should I invest in getting the insulation redone.
All advice gratefully received.....
There is cavity wall insulation of a sort, kind of fibre-glassy, but when I recently fitted a tumble-dryer duct, there does not appear to be a great deal of it. Whether this is because it has all settled down the bottom or something I don't know, but it was decidedly wispy.
Is there any rule of thumb to tell me, based on the skimpy info above, how much money I could save by going for a more efficient boiler so I can work out how long it would pay back over. Is a solid-fuel granules boiler a better option, or should I invest in getting the insulation redone.
All advice gratefully received.....