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Oil Boiler & Heat Pump Hybrid System

 
Air Source Heat Pumps (ASHPs)
Last Post by Mars 6 hours ago
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 paultheheating
(@paultheheating)
Active Member Member
Joined: 12 hours ago
Posts: 2
Topic starter 02/11/2025 3:47 pm  

We have a tenanted 3 bed detached house double glazed and roof insulated with oil boiler for hot water and CH. No gas. Would like to be more environmentally friendly landlord but understand that ashp on their own can be less efficient in very cold times so would like to consider bivalent system with existing oil boiler and a new ashp. Which companies should I be looking at for bivalent ashp that will run with old oil boiler? 

Recon that gov grant should cover the cost of the ashp so it would only be the install cost of a controller and some plumbing.

Have discussed it with tenant, and they have no funds to pay higher rental to be green

 


This topic was modified 7 hours ago by Mars

   
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 3659
02/11/2025 4:42 pm  

Welcome to the forums.

Not a popular opinion, but I actually like hybrids. That said, the BUS grant doesn’t currently cover hybrid systems… to qualify, the old boiler has to go. There’s been talk about restructuring the scheme to allow them, but as far as I know, that’s not in effect yet.

That aside, a well-installed heat pump in a 3-bed home really shouldn’t need a hybrid setup.

If you do go down that route, the best brands for hybrid control are NIBE and Stiebel Eltron. From our own (sometimes painful) experience, it’s the controls that make or break hybrid systems.

Your installer will need to be familiar with control logic for hybrid systems as it’s often the weakest link.


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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3282
02/11/2025 4:45 pm  

My advice quite seriously is don't, far too complex for a tenanted property.  Get a decent ashp instal and advise tenants to get a sensible electricity tariff.  Done properly (which unfortunately quite a few aren't) it will be same price or cheaper to run than gas, and more comfortable.   Plus you will be eligible for BUS.

People here can provide advice on how to qualify installers.  Unfortunately there are cowboys out there.

Do you have any consumption records?  These are useful for sense checking heat loss which is key to design and often way out.


This post was modified 6 hours 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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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 3659
02/11/2025 4:49 pm  

@paultheheating, where in the country are you? 


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