Combi bolier installation location

Postby rowsonj » Tue Feb 12, 2008 7:09 pm

I want to install a combi boiler to an old house together with a central heating system and a thermostaic mixer shower. I have been told that to get adequate pressure for the shower the boiler will have to be installed upstairs on the same level as the shower. I thought that combi's supplied hot water at mains pressure and don't understand what I have been told.
Comments / help much appreciated
Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Tue Feb 12, 2008 6:48 pm


Simply Build It

Postby htg engineer » Tue Feb 12, 2008 8:21 pm

You're correct, the hot and cold will both be at mains pressure - therefore it doesn't matter where your shower is in relation to the boiler (without going to extremes).

As long as your mains cold flow rate and pressure are good now, then there shouldn't be any problem once the combi is fitted.

If your hot water is currently 22mm pipe I'd suggest replacing with 15mm to feed the shower.

My combi is downstairs, and I'm fitting a thermostatic bath shower mixer upstairs. I have seen many like this and there's no problem.
htg engineer
Rank: Project Manager
Posts: 3224
Joined: Tue May 22, 2007 5:22 pm

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides

  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!


  • Related Topics