It depends on who receives the money. In the UK the grant is deducted from the quote before you pay anything and Ofgem reimburses the installer on a weekly payment cycle, usually within five working days of approving the claim, with the whole process running 4–6 months. In Germany you pay in full and claim afterwards, and you apply with a signed contract that only takes effect once KfW approves the grant.
Who actually receives the grant money?
Two models exist across Europe and they produce completely different cash-flow experiences.
Discount at source. The installer applies, deducts the grant value from the quotation and invoices you the net figure. The scheme then reimburses the installer. Under the UK Boiler Upgrade Scheme this is now mandatory: the voucher value must be deducted from the customer's quote before any payment is made, so the grant money never passes through the homeowner's hands.
Reimbursement after the fact. You pay the full invoice and claim afterwards against evidence of completion. Germany's KfW route, Italy's Conto Termico and most tax-based reliefs work this way. It means finding the whole sum first, which is the single most common cash-flow surprise in a domestic retrofit.
| Scheme | Who applies | Who is paid | Cash needed upfront |
|---|---|---|---|
| UK Boiler Upgrade Scheme | Installer, MCS-certified | Installer, via Ofgem | Net price only |
| Ireland, SEAI | Homeowner, registered installer required | Homeowner, after inspection | Full price |
| Germany, KfW 458 | Homeowner, before contract signature | Homeowner, after completion | Full price |
| Italy, Conto Termico 3.0 | Homeowner or installer to GSE | Homeowner, single instalment under €15,000 | Full price |
| France, MaPrimeRénov' | Homeowner, via Anah | Homeowner, advance possible for low incomes | Usually full price |
How long does the UK scheme take end to end?
About four to six months from first contact to the grant being settled, even though the paperwork itself is quick. The sequence is: survey and quote, voucher application by the installer, installation, commissioning, redemption claim, payment. Where the system is commissioned before the voucher application, that application must be properly made within 120 days of commissioning, and Ofgem pays approved redemptions on a weekly schedule, usually within five working days of approval.
Two 2026 changes shortened parts of it. The EPC requirement was removed on 28 April 2026, deleting a common pre-installation delay, and digital claims by MCS installers have shortened processing further. Most of the remaining elapsed time is installer scheduling, not administration.
What sequencing mistake costs people the grant?
Signing a contract or ordering equipment too early. Germany is the strictest example: the supply and installation contract must be signed before the KfW application is submitted through the Zuschussportal, and it must contain a suspensive or resolutory condition making it dependent on the grant. It also requires a Bestätigung zum Antrag issued by an accredited energy expert or specialist contractor beforehand, and a Fachunternehmererklärung plus proof of costs afterwards. A homeowner who signs an unconditional order or starts work before applying has forfeited the subsidy permanently, with no appeal.
Other traps worth naming:
- Deposits. In several schemes a paid deposit counts as contract commencement.
- Claim windows. Italy's Conto Termico requires the application to GSE within roughly 60–90 days of completion; sources differ, so confirm the current deadline on gse.it.
- Certification of the installer. UK claims require MCS; France requires RGE; Germany requires a qualifying specialist firm. An uncertified installer cannot be retro-fitted into the process.
- Degression. Germany's Klimageschwindigkeitsbonus steps down every six months and eligible costs shrink by €750 each half-year, so a delayed application is a smaller grant.
Can I use an umbrella or subcontracted installer?
Often yes, and for small firms it is the normal route: a certified company registers the installation while the physical work is carried out by a subcontractor under its supervision and quality system. The certified business remains accountable for design, commissioning and the claim.
Check three things before agreeing to it. The certified firm must be named on the paperwork you sign, not merely mentioned. The workmanship warranty and any consumer-code protection must sit with a company you can still reach in five years. And the arrangement must not add a margin that quietly cancels the grant — a point worth testing when comparing two heat pump quotes and when assessing how much certification adds to the cost.
How should I plan the cash flow?
Assume you will fund the full amount unless you are in a discount-at-source scheme, and build a bridge for three to six months. Where the grant is reimbursed, ask the installer for a staged payment schedule tied to delivery and commissioning rather than a large deposit, and keep the final retention until the system has run through a full heating cycle.
One last point that matters more than the timetable: rates changed three times in July 2026 alone across Germany, Poland and the United Kingdom. Any figure in a proposal older than a quarter should be re-checked against the current official rules before you sign, and country-level detail sits in which European countries offer heat pump grants in 2026?
Frequently asked questions
Do I pay the full price and get the grant back later?
In Germany, Ireland, Italy and France, generally yes. In the United Kingdom, no — the Boiler Upgrade Scheme value must be deducted from the quote before any payment, so you only ever pay the net amount.
How long does Ofgem take to pay the Boiler Upgrade Scheme grant?
Approved redemption claims are paid to the installer on Ofgem's weekly cycle, usually within five working days of approval. Where the system is commissioned before the voucher application, that application must be made within 120 days of commissioning.
What happens if I sign an unconditional contract before applying in Germany?
You lose the grant. KfW requires a signed contract before you apply, but that contract must contain a suspensive or resolutory condition tying it to the subsidy decision. There is no retrospective route back into the scheme.
Can the grant be paid directly to me instead of the installer?
Only in reimbursement-model schemes. Where the scheme requires the discount to be applied at source, the payment structure is fixed and the installer is reimbursed — that design exists specifically to remove the customer's cash-flow risk.