Should we swap the oil boiler for a heat pump?

Nothing in Scottish law today makes you take out a working oil boiler. The Scottish Government's heat in buildings policy page describes support for existing homes, not a requirement, and the ban on oil and gas boilers as main heating applies to new buildings. So the question is one of timing and money rather than rules.

The money side has moved in favour of heat pumps. As of November 2026, the Home Energy Scotland Grant and Loan offers up to £7,500 grant plus an optional interest-free loan of up to £7,500 for an air, ground or water source heat pump, with an extra £1,500 grant for eligible rural homes.

What does the law say about oil boilers now?

For an existing home, nothing forces a change yet. The New Build Heat Standard factsheet says fossil fuel gas and oil boilers cannot be the main heating in new-build homes; that rule is about new buildings and some conversions.

For existing homes, the Scottish Government published a draft Buildings (Heating and Energy Performance) and Heat Networks (Scotland) Bill on 18 November 2025 and said it planned to introduce it after the May 2026 election. Its heat in buildings future plans page restates a commitment to decarbonise heat in buildings by 2045. Proposals can change, so check that page before deciding anything on the strength of a future rule.

When is the right time to swap?

The cheapest moment is usually before the old boiler fails, not after. If an oil boiler breaks in January, the quick fix is another oil boiler, while a heat pump needs a survey, a written grant offer and an installer's slot. Home Energy Scotland's installation checklist says heat pump work cannot start until you have a funding offer in writing, and the job must be finished and claimed within nine months.

If your boiler is fairly new and serviced, there is no rush. Keep it serviced by an OFTEC-registered technician (see who should service the oil boiler) and plan the change for later.

What happens to the oil tank?

Taking oil heating out leaves a tank in the garden, which needs emptying and removing by an OFTEC-registered technician or a licensed firm, not by you. Never cut, tip or try to move a tank yourself. Our page on whether an oil tank needs a bund covers what the tank rules are while it is still in use.

Will a heat pump suit our house?

Home Energy Scotland's checklist says the home must have adequate loft and cavity wall insulation to claim the grant, and the installer and product must be MCS certified. A heat pump runs at lower water temperatures than an oil boiler, so some radiators may need changing. Older stone houses are covered in will a heat pump work in a stone cottage.

What to look at first

1. Age and service record of the oil boiler.
2. Loft and cavity insulation: done, part done or missing?
3. Whether your postcode is rural for the Home Energy Scotland uplift.
4. Space outside for the unit and inside for a hot water cylinder.
5. Three written quotes, each showing a heat demand figure.

Yours to do, and theirs

You can

• Phone Home Energy Scotland on 0808 808 2282 for free advice and an energy report.
• Wait for the written grant offer before signing or letting work start.
• Keep the oil boiler serviced until the switch.

Leave to them

• An MCS certified installer designs and fits the heat pump.
• An OFTEC-registered technician decommissions the oil boiler, fuel line and tank.

In short

No law makes you remove a working oil boiler today, and the grant for a heat pump is generous as of November 2026. Plan the switch while the boiler still works, insulate first, and never let work start before the written offer arrives.

Also asked about this

Is there a grant to replace an oil boiler with a new oil boiler?

The Home Energy Scotland Grant and Loan funding page lists heat pumps, heat networks and biomass boilers among heating systems, not oil boilers.

Can we keep the oil boiler as a backup to a heat pump?

Ask your installer and Home Energy Scotland before planning that, because the grant conditions and system design both affect whether a hybrid makes sense.

Does a rural address get more grant?

Home Energy Scotland's terms say homes in remote rural, island or off-gas accessible rural areas, using the Urban Rural Classification, can claim an extra £1,500, taking the heat pump grant to £9,000.

What if we replaced a heat pump that had failed?

Home Energy Scotland says replacement heat pumps get no grant but can get an interest-free loan of up to £7,500.

Sources, checked 5 November 2026

1. Home Energy Scotland — Home Energy Scotland Grant and Loan
2. Home Energy Scotland — Grant and Loan terms and conditions
3. Home Energy Scotland — Heat pump installation checklist and guide
4. Scottish Government — Heat in buildings
5. Scottish Government — Heat in buildings: future plans
6. Scottish Government — New Build Heat Standard factsheet
7. MCS — Consumers