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Volumiser required on Grant R290 air source heat pump?

 
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Air Source Heat Pumps (ASHPs)
Last Post by Max Abbey 5 days ago
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 Max Abbey
(@max-abbey)
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Joined: 4 months ago
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31/01/2026 12:09 pm  

@patrick That is great news, must chase that up, Thanks



   
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 Judith
(@judith)
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Joined: 2 years ago
Posts: 481
01/02/2026 5:31 pm  

Posted by: @patrick
↑

Great news this week too. The heat pump grant here has increased from €6500 to €12500. 

Thats generous! Does the small print of the grant allow DIY? In UK it has to be a MCS registered professional( doesn’t guarantee competence) and replacing an existing fossil fuel boiler. 

 


2kW + Growatt & 4kW +Sunnyboy PV on south-facing roof Solar thermal. 9.5kWh Givenergy battery with AC3. MVHR. Vaillant 7kW ASHP (very pleased with SCOP 4.7) open system operating on WC


   
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 Max Abbey
(@max-abbey)
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Joined: 4 months ago
Posts: 6
01/02/2026 7:05 pm  

If it follows other grants here, then, as before, you have to use a registered contractor. And like in the UK there is no guarantee as regards quality etc 
It puts me off using grant assistance in most cases but at that level of support I will look more seriously into it.

There is one other really good scheme here for vacant homes. If the house is over 2 years not lived in then there is a max of €50k for bringing it back into habitable use. This grant does allow for DIY (with local authority oversight) so that sum can be pretty much parts only support.



   
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GrahamF
 GrahamF
(@grahamf)
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Joined: 9 months ago
Posts: 111
01/02/2026 7:39 pm  

@jamespa I agree that it is important to avoid a 4 port buffer or low loss header, due to the impact on efficiency.

My understanding is that volumisers should be installed on the return circuit, not the flow?


Grant Aerona 290 15.5kW, Grant Smart Controller, 2 x 200l cylinders, hot water plate heat exchanger, Single zone open loop system with TRVs for bedrooms & one sunny living room, Weather compensation with set back by room thermostat based load compensation


   
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GrahamF
 GrahamF
(@grahamf)
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Joined: 9 months ago
Posts: 111
01/02/2026 7:42 pm  

I have a Grant Aerona R290 15.5kW heat pump, which is running very nicely.  Certainly don't go for the Aerona3 R32 heat pump or its antiquated controller.

 

I would be happy to help you with how to use the Aerona R290 Smart Controller.


Grant Aerona 290 15.5kW, Grant Smart Controller, 2 x 200l cylinders, hot water plate heat exchanger, Single zone open loop system with TRVs for bedrooms & one sunny living room, Weather compensation with set back by room thermostat based load compensation


   
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JamesPa
 JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 4164
01/02/2026 7:44 pm  

Posted by: @grahamf
↑

My understanding is that volumisers should be installed on the return circuit, not the flow?

There is a thread from a year ago where this was debated at length and the conclusion, well argued imho, was flow is better but it's likely only to make a difference in a relatively small minority if cases, and the difference will be a marginal comfort one.

 


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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 Max Abbey
(@max-abbey)
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Joined: 4 months ago
Posts: 6
01/02/2026 7:59 pm  

@grahamf Indeed looking at R290 models only. It will be a good while until I actually get to interpret the controls but thank you in advance



   
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