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Thank you everyone! It really helped to have your knowledge behind me. Took a bit of negotiation with the contractor, but pipes are now inside 25mm continuous closed cell insulation and on top of 50mm PIR as well, with the rest of the 150mm floor insulation built up snugly around them. Not quite as good as them just being inside the thermal envelope of the house but considering where we started I'm really pleased with the end result. A

Thanks Kelvin! The lagging they've put on our pipes looks like it's this stuff - only about 13mm thick https://www.screwfix.com/p/pipe-insulation-28mm-x-13mm-x-1m-35-pack/43273?tc=OT9&ds_rl=1241687&ds_rl=1245250&ds_rl=1249404&gad_source=1&ds_rl=1245250&ds_rl=1247848&ds_rl=1248151&gclid=EAIaIQobChMIg7uW-tq-hgMVp4FQBh1DxADFEAQYByABEgJiY_D_BwE&gclsrc=aw.ds Would the standard be to use duo insulated pipe instead? What's a reasonable minimum thickness of insulation?

Thanks JohnMo. Sorry for the stupid question - what does biased mean?

Hi everyone, Newbie poster here. Newbie ASHP-er as well! I am really hoping someone here can help.... Pipework for our ASHP (Samsung Gen6 8kW) is being installed at the moment, and the ASHP will be in a new build extension to our house, located on the rear external wall. The pipework runs approx 5m internally in a straight line to a very small plant room (cupboard). So everything for the HP is in the newbuild part of the house. I have a question about where the installer has put the pipes to and from the ASHP relative to the floor construction. The floor will be made up of 100mm concrete slab / DPM / 150mm PIR insulation / another DPM / UFH pipework / screed. The heating engineers have installed the inflow and outflow pipes from the ASHP on top of the concrete (ie under the insulation). The insulation they've put around the pipes looks like just the standard grey lagging you put around pipes inside a house and they're not laid on any extra insulation or anything. This, to me, is a crying shame, because of the heat losses that just wouldn't happen if the pipes were chased into the PIR. But because they've already installed the pipes, and they want to get on with the PIR and UFH I am certain they'll strongly resist my efforts to get them to change it and tell me a load of old rubbish as to why it's not possible. They've done loads of ASHP installations (and are very confident in their own abilities...) so something 'official' would really help me. Can anyone point me to any guidance that covers where pipes should be located / minimum insulation standards? I looked at the MCS information and couldn't see anything specific, will take a look at Samsung installation guide too. I will be very grateful indeed if anyone can help.