Boxt Heat Pump Installation Experience

Adrian · 2024-12-15T14:00:24Z

I’ve just had a heat pump installed by Boxt and thought I’d report my experience here, so it might be useful to others. For context, mine is a 1930s semi detached house, heavily insulated with 300mm loft insulation, 50mm internal wall insulation, Swedish double glazing and a 2010 build extension with more insulation. I got a lot of other at least initial quotes and all of them where too big resulting in mostly 8kwh machines which would have been grossly oversized. Like octopus Boxt provides an online fixed price including replacement radiators, from what I see just based on the heatpump size, £3199 for the Valliant 3.5 unit and going slightly up from there (£3599 for the 5kw unit). After getting the initial quote online I adjusted the age of the property to get the correct model (in my case 1995-2006 to get a 5kw unit and called them to check that that was ok, which it was. They did require immediate payment by credit card, so that is a little suboptimal, but my thought was that in the worse case I get the material for that price and redo the plumbing myself and the credit card payment gives some sort of protection against bankruptcy etc. The other problem I had was that the space for the hot water cylinder under the stairs was limited and with only two of us in the house, 99% of the time taking shower and me taking a very dim view on two people having a bath within twenty minutes of each other (which is what the MSC guidelines recommend), I needed a smaller 150l cylinder. Boxt was happy to accommodate me with respect to that, which was a first. They installed the Vaillant 150l slimline unit. The install started five weeks after the order and went smoothly, all performed by one plumber and the electrician spending Thursday connecting it all. Hot water was restored on Tuesday and heating on Friday. The installed equipment is: Vaillant arotherm 3.5 Vaillant 150l slimline pre-plumbed dhw cylinder anti freeze valves all the usual expansion vessels, valves etc two K2 replacement radiators, they would have done 4 if I hadn’t shuffled a couple of them around the house beforehand. 18l volumiser Here are couple of pictures for your enjoyment:

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Air Source Heat Pumps (ASHPs)

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Toodles

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20/09/2025 11:28 am

@editor Mars! Wash your mouth out! (I think we should regard the words “Buffer Tank” as ones that require a hefty contribution to the swear box.😉 Toodles.

Toodles, he heats his home with cold draughts and cooks his food with magnets.

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