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Surface mount or bury primaries for heat pump installation?

 
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Air Source Heat Pumps (ASHPs)
Last Post by Aventus Eco 1 week ago
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 tomasmcguinness
(@tomasmcguinness)
Trusted Member Member
Joined: 1 year ago
Posts: 26
Topic starter 29/06/2025 9:52 am  

What about those pipes that include conduits for electrical cables such as Isoflow or Uponor?

 

Owner of a ridiculously oversized 35kW boiler and trying to make it as efficient as possible. 4.8kW solar PV with 5.4kWh storage. EV driver.
Follow my journey at https://www.youtube.com/@tomasmcguinness
Next big project is a heat pump!


   
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 Transparent
(@transparent)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 2433
29/06/2025 3:17 pm  

Can we have some links to those you're considering please @tomasmcguinness ?!

I think we're basically going to say "follow the manufacturer's instructions",
but it would still be good to check out what those are.

Save energy... recycle electrons!


   
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Aventus Eco
 Aventus Eco
(@aventus-eco)
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Joined: 3 months ago
Posts: 4
01/07/2025 10:17 pm  

@tomasmcguinness, I think your best bet would be using underground ducting. You can get pre-insulated pipe for the flow and return, plus an additional two ducts, one for the power cable and one for the data cable.

At the ends, when everything comes up out of the ground, you can use press fittings to connect onto copper or, even better, insulated MLC pipe. If you go with copper, just make sure you insulate it properly with something like Primary Pro.

There are a few different manufacturers out there, but City Plumbing stock the ducts… you just tell them the length you need, and they’ll cut it to size and can do next-day delivery.

Also, make sure you get the proper end seals where the duct exits the ground. You basically heat it up with a heat gun and it seals the duct tight around any pipes, just like electrical heat shrink. It’s dead easy.

As for depth, 600mm is standard guidance to protect from frost and spade damage, but if you're struggling with that, going a bit shallower isn’t usually a big issue. Frost isn’t a real concern here since your flow and return will be in an insulated duct, unlike a mains water pipe. attached are some links and install guidance PDF.

Pre-Insulated Underground Pipes

INS140-3225-2HSC - Pre Insulated Pipe 140mm x 25mm or 32mm Heat Shrink Cap | Polypipe

pre-insulated_installation_guide_0.pdf
This post was modified 1 week ago by Mars

   
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