insulated pipe house entry - through soffit?

[ian192744]

planning my ASHP location, and pipe route to get to where all the rad circuits distribute from and likely buffer location -  1st floor airing cupboard.

 

seems to me like my easiest option will be to go outside , up from ground level , round an awkward corner, then up the side of the house to roof level (2 story house), then into the loft space, across the loft then drop into the airing cupboard.

 

If I go for the option of "get inside as soon as poss", the  internal route will require a whole lot of lifting of boards (chipboard - 1970's house so a pain) , lots of joist drilling / notching and we have to go through 2 external walls  (there's an extension that causes this to be 2 not 1) - all quite a lot of hassle and time consuming. Plus with 32mm pex, thats big joist holes. Prefer not 28mm copper as seriously pricy these days.

 

whereas the external route for my house I reckon is do-able really quickly , mostly DIY able , and little/no major hole drilling. once into the loft, I can bury pipe under insulation and the routing is easy. Question - has anyone used pipe like this https://ingoodnic.uk/25-25-90mm-2.html  ? I'm thinking 10m of dual 32mm preinsulated as 32mm has more or less equivalent ID to 28mm copper which seems to be the recommended by most installer. It'd go the side of the house and in through a hole in soffit into the loft space. No wall drilling.  My soffits are really wide so room for bend radius should not be an issue. It'd be in a non-visible corner so no issues with spoiling appearance  or similar.

 

ta

Ian