Rich210

But the boiler will make use of condensing efficiencies, so that is free heat I wouldn't have had before. There was a bit of a chill last night so I had a go in our large living room with a t22 rad that always been undersized. Running the rads at 33'c flow my partner was impressed. The rad also needed bleeding so the fans were working on a defunct rad. On the boiler working harder, my boiler is a crap baxi 830 boiler that won't modulate below 6kw. Rough calculations suggest 7.5kw would heat my home at -2'c. I have no worries about making the boiler work harder it's already massively oversized and poorly designed. I'm much more interested in lower flow and return temps so when it does fire up its making best use of the gas. Hopefully I'll get it replaced with a ashp within the next couple of years. This winter is going to be an experiment to see how much I can get out of what I've got. The fans are a cost effective way of theoretically increasing the size of rads without installing new radiators everywhere. This is a desirable thing to do to improve heating efficiency. I'm presuming people adding radiator fans to combi boiler domestic central heating system rads are doing it for the same reasons. If you're unsure about how combi boilers work google combi boiler efficiency and you'll see a graph that's very clear and easy to understand.

That's amazing prices, I think the up tick is due to the market instability and lack of government over the last month or so. I'm currently working towards making my house suitable for ASHP. Ideally I see solar PV and ASHP being the future for my property. We shall see!

My house has a mixture of K2 and K1 rads. The majority are K1 rads so I bought 3 double sets of the speed-comforts. I know they're fairly expensive, but I wanted a fairly hassle free solution to improving the comfort in the house and with gas prices high, I rationalised them as an investment. Subsequently I bought 8 80mm fans off ebay along with a 12v controller. I'm effectively using the speedcomfort's for the plug initial fans and control mechanism for turning the fans on and off. Probably an expensive way of doing it! But, I'm making savings on the ebay 80mm fans and I'm arranging them like Ian using the the magnets. Originally I thought of getting the craft glue gun out and just sticking them to the underside. I like the look of the artic fans, and I think for simplicity, I'd go with those next time. I was interested in finding out how these perform with ashp. I understand that ashp don't like a big flow and return temp difference, and obviously the fans increase the temp difference which is really helpful for combi boilers.