Ian B

Not sure if you've got that quite right, but I don't know enough? You state 150mm insulation and 50mm liquid screed. Yes I suppose 150mn insulation but I think with PIR you get to a certain thickness and the gains are minimal? The screed at 50mm I would be concerned with cracking and heat loss compared to a thicker floor as the concrete acts as a thermal store?

Again thanks for the replies

I appreciate what you say about learn and understand about the technology and I have read this before and the advice is obviously well meaning. What a sorry state we are in (I wonder if it's just our wonderful country because heat pumps are common place and have been for many years in most of Europe) because let's face it some people wouldn't be able to understand or work out what they need. Really why should they if they're paying someone who should be an expert in their particular field. Sorry for the rant but it's quite sad how things are

Thanks JamesPa for taking the time with your reply, I will have a read through the link you sent. We have had the house for some time and stripped it out without ever using oil so cannot give my annual use of oil. I bought the ufh pipe with a bit of a plan (as you touched on it of how good the calcs are?) The floor area is 173m2 although this seems to include the garage? I would have said it was more like 150m2 of rooms to be heated. Heat losses are just under 4kw

Thanks for the comments and yes I have heard similar. I take it you didn't use them, what did you do

Hello Everyone, I'm new to Buildhub although have read posts in the past and appreciate how useful it is especially with individuals and their knowledge. My position at the present time is I have 1930s semi in Cheshire which I suppose you could say is semi rural which is why it was heated by oil with no mains gas. We gutted the property and extended it with a single storey rear extension ( kitchen/ diner) and 2 storey side extension (garage, bedroom). My provisions towards heating so far have been removal of existing floors downstairs with a make up of a new slab, 100mm insulation, underfloor heating pipes and a traditional dry screed ready for some form of tiles. I've renewed the loft insulation (now around 300mm). The old external walls (no cavity) have been cladded internally with 50mm PIR and any new walls are insulated within the cavity. I am asking for advice and opinions on which way to move forward with the provision of a ASHP. I have read some of the horror stories of poor planning and installation and how you can easily come unstuck with some of the very poor trades we have to put up with. I recently read about 'The Cool Energy Shop' (imagine some other companies doing the same?)in a thread on here and how you can get your pump and cylinder from them through the Governments grant. Then I've heard don't bother with the grant and just buy yourself, again I've read some of the companies not fit for purpose and you're not really benefitting from the grant because they just screw you over? Finally I will say I have been sucked in at times to the whole thing of the negativity around heat pumps (I think I saw a thread about certain media outlets, Guardian and others dissing heat pumps), so you start to question yourself and worry which way to go? Sorry to rattle on but any help/advice would be appreciated by people who have done and from some of the guys in the know on here Thanks Ian