Heating
Hybrid heating: a heat pump working alongside a boiler
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A hybrid system keeps a gas, LPG or oil boiler and adds a heat pump, usually an air source unit, with a controller deciding which one runs. The heat pump covers the milder part of the year and the boiler takes over in the coldest spells or for hot water. It can be a practical halfway house, but it is excluded from the main grants, so the numbers need checking honestly. One heating installer, and only one, can buy the request you send us.
- Exactly one business. Your request is handed out once. After that, no other business sees it.
- You know who will be in touch. Before the business receives your contact details, we send you its name, address and phone number.
- Withdraw at any time. You can withdraw your consent at any time – using the link in our email.
How a hybrid system decides what runs
The controller switches between the heat pump and the boiler, or runs both together, based on outdoor temperature, the heat demand and sometimes energy prices you enter. Approved Document L says that where a heat pump shares a building with other heat sources, they should be brought into a single control system; two separate controllers fighting each other are a sign of a poor installation.
Some hybrids are packaged units from one manufacturer, with a heat pump designed to sit alongside a particular boiler. Others combine a heat pump with an existing boiler. The packaged route is simpler; the add-on route can make sense when the boiler is fairly new and has years left in it.
When a hybrid makes sense and when it does not
A hybrid can suit a house where a heat pump alone would need extensive radiator changes that you cannot do yet, or where you want to cut gas or oil use now while planning deeper insulation work later. The boiler handles the cold days that would otherwise demand the biggest radiators.
It makes less sense if the house could take a full heat pump with modest changes. You keep paying the gas standing charge, still need an annual gas service, maintain two appliances and lose access to the grant that a full heat pump would attract. The smaller heat pump in a hybrid may also be less efficient than a correctly sized standalone one, if it spends much of its time at the edge of its range.
Make a requestGrants and VAT
The Boiler Upgrade Scheme in England and Wales does not fund hybrid heat pump systems, for example a gas boiler combined with an air source heat pump. The Home Energy Scotland grant and loan also exclude hybrid heat pumps; only heat pumps that provide all of the heating and hot water are eligible there.
For VAT, heat pumps are on HMRC's list of zero-rated energy-saving materials, while gas boilers are not, so the VAT treatment of a hybrid installation depends on how the work is supplied. Ask the installer to explain how VAT is charged on the quote.
What the survey and quote should cover
The installer still needs a heat loss calculation, because it determines how much of the year the heat pump can carry the house and at what flow temperature. They should explain the switchover point they intend to set, what the boiler does for hot water, and how the settings could change later if you insulate or upgrade radiators.
Two regulated trades are involved: gas work on the boiler must be done by a Gas Safe registered engineer, and the heat pump should be designed and commissioned to MCS standards if you want the installation certified. Many firms hold both; check.
- heat pump model and output, and whether the boiler is new or retained
- the single controller and the switchover strategy
- how hot water is produced
- outdoor unit position and the permitted development check
- Gas Safe registration for the boiler side and MCS certification for the heat pump
- the path to a full heat pump later, if that is your plan
Your request, one installer
Tell us the existing boiler, the house and why you are considering a hybrid. Heating installers covering your area see the request without your contact details; the first to buy it is the only one who receives it, and it pays Offrano for it. You pay nothing.
We email you the installer's name, address and phone number before your details are shared, and you can withdraw consent from any email. We cannot promise the request will be taken or that you will receive a quote. We verify only that the buyer is a registered business, so check Gas Safe and MCS registrations yourself.
Frequently asked questions
Can I get a grant for a hybrid heat pump?
Not through the Boiler Upgrade Scheme, which excludes systems that combine a heat pump with a fossil fuel boiler, and not through the Home Energy Scotland grant and loan, which fund only heat pumps that cover all heating and hot water.
Can I add a heat pump to my existing boiler?
Often, yes, with a controller that manages both. Whether it is worthwhile depends on the boiler's age, the heat loss of the house and your energy prices. A packaged hybrid from one manufacturer is usually simpler to control.
Does a hybrid still need a gas safety check?
The boiler still needs regular servicing by a Gas Safe registered engineer, and in rented homes the landlord's annual gas safety check still applies. The heat pump needs its own maintenance.
Is a hybrid a step towards a full heat pump?
It can be, if the heat pump and pipework are chosen with that in mind. Ask the installer whether the heat pump could later be replaced or upsized to run alone once the house is better insulated.
Who will receive my request?
Just the installer who buys it. We email you its details before it sees yours, and the request cannot then be sold to another business.
Ready to make your request?
Describe your project – your request goes to exactly one business.
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