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My Grant R290 9kW Heat Pump Installation

 
Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 1 day ago
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 petch
(@petch)
Active Member Member
Joined: 2 months ago
Posts: 8
Topic starter 13/04/2026 8:15 pm   [#2947]

After what has now been a couple of months of research and getting quotes, work has finally begun

So far all the old radiators are out and about half of the news ones have been fitted to the wall (but not yet plumbed in)

New small consumer unit added in the plant room and power cable from the main consumer unit in the garage has been fed to it. There's a fuse for the immersion in the new Grant 250L DHW cylinder (yet to be plumbed in) and a second for the Grant R290 9kW, also yet to be plumbed in

Trunking has been laid out and a small bit of path around my house has been dug up (pipes needed to go overhead or under an outdoor step, I opted for going under). It's a short run to begin with and I didn't see the harm in going under a single concrete flagstone if it's insulated. Big name installers wanted to do a deep trench but also said they can't do a trench for such a small distance.

The heat pump itself has plenty of room around it whilst also being shielded from wind from all angles, and should also benefit from solar gains as it is in a south facing garden

Is there any checklist I can follow to ensure everything has been done properly? I don't want to bother the guys doing the work too much. I'm meaning to ask if they flushed or will be flushing the system (I kept a few old radiators and the existing pipework)


This topic was modified 1 day ago by petch
This topic was modified 15 hours ago by Mars

   
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JamesPa
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 4634
13/04/2026 8:45 pm  

No buffer or low loss header

Grant controller in sensible place in house

No third party controls

Weather compensation adjusted

Radiators balanced

Explanation how to operate it, how to tweak the WC curve (because you will probably need to once it gets cold next season), how to change dhw temperature and timing.

Everything well insulated, outside insulation closed cell/waterproof

Freeze protection valves installed

Dirt filter installed and they should show where it is.

Ensure odu level and there is a route for defrost water to go away without causing a path to get icy.

System and controls diagram (possibly just the ones in the manual, but they should confirm which ones

All manuals including the installer manual to remain

 

Probably a few others that someone else will contribute.


This post was modified 1 day ago 2 times by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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