Hi, this is my introduction post. I'm mainly interested in the ins and outs or ASHPs especially with regards to their suitability with Microbore plumbing. All advice and guidance welcome. Cheers!!!

They produce heat at lower temperatures more efficiently. Best plan is to improve fabric insulation to the point that the radiators will work as low temperature emitters 

 

microbore is not so bigger problem but shifting heat around will require a good pump and clean pipes 

Have you already got a heating system in that uses microbore?

 

Do you know how to do thermal calculations for a house?

Hi Both, @SteamyTea I've had some quotes and have got hold of the Freedom Heat pumps calculator and have had a play around with that. We're thinking of replacing a 20yo Gas boiler which obviously makes the cost/benefit calculation quite tight. It's existing microbore and we've had one suggestion of using a low loss header to help with the issue and another of using a heat exchanger so keeping the Radiator system and heat pump system totally separate, however the Ovo energy government trial being organised by Retrofit works in London dont want to use us unless we consider having all the microbore replaced with larger diameter pipework, as they say Daikin and Mitsubishi who are supplying the trial dont have any solutions to avoid potential noise and cold spots that they think the microbore may cause. Sorry for the lengthy post but I'm getting pretty confused at the mixed messages! ?

I think there is another thread about the Ovo trial. 

https://forum.buildhub.org.uk/topic/20085-ovo-heat-trial-preliminary-design/

Awesome, I shall post my lengthy rantings there and see if there's any useful advice forthcoming. Thanks