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Thanks for the warm welcome guys! I was sold on a GSHP in 2019 and have had this in mind ever since, however this forum has convinced me otherwise. I currently have a design for a 12kW NIBE GSHP system and my question is; can the NIBE GSHP pump be exchanged for a 12kW ASHP? I assume a kW is a kW irrespective of source!? However, from the reading I have done on here, 12kW seems quite a large pump for the c. 350m2 house!? I have had SAP calculations completed but I am a little baffles by the results to be honest and not sure how this helps me size an appropriate pump.. I really thought I had done a great job with the insulation but it appears I haven’t done that good a job at all…! (If only I’d come across this site earlier in proceedings!) ‘ The original UFH design has pipe spacing at 200mm centres but I’ve read on the is forum that 150mm or 100mm centres give improved heating. I am going for a wet plaster for increased air-tightness to improve the effectiveness of the MVHR. My only issue to overcome with the MVHW is how to run the ducting in the vaulted ceilings with cold-roof construction!? Steve.

Hi All! I have only just stumbled across this site but so glad I did! I am in the middle of a c. 350m2 new build near York with the build now being watertight. Hoping to get my GSHP(!) installed in time to benefit from the RHI, I was disappointed to hear this week of supply issues from the pump manufacturer, therefore I set about trying to find an alternate supplier, which lead me to this site… Following lots of hours of reading as to the relative merits of ASHP’s (there is no mains gas on site), I am now quickly looking to re-design the proposed system. The house is brick and block construction with 150mm cavities (100mm insulation and 50mm air gap). On top of the 200mm(?) concrete slab is 100mm insulation with the plan to fit UFH in a screed above this. The 1st floor is block and beam construction with no plan to put insulation above it (this was a recommendation from the architect but unsure if this is good advice or not?). The 1st floor is also to have UFH in a c. 65mm screed. I am looking to fit an MVHR system to the property but know little about them, other than what I have read on here over the last few days, so have contacted BPC Ventilation for a design. The plan, when funds allow(!), is to fit solar PV (possibly with battery storage?), to the South facing roof. I have lots of questions regarding ASHP, UFH and MVHR but I am trying to find answers through searching the forum before asking! Thanks to everyone for sharing a wealth of knowledge on this site! Steve.