After an ECO4 install: warranties, manuals and paperwork (2026)

Guide by ApplyFreeBoiler.uk (Reliant Energy Solutions Ltd), a heating and insulation installer in Bury, Greater Manchester. We are not the government, Ofgem or an energy supplier.

The day after an ECO4 boiler or insulation install can feel like a pile of papers and new kit. Keeping the right documents, knowing what the guarantees cover and asking for a demonstration makes later problems much easier to sort out. This checklist is general information from a Bury-based heating and insulation installer and does not guarantee funding.

1. Collect the handover pack before the engineers leave

Ask for a folder or email pack that lists what was fitted, the date, the company name and a contact number. Check it includes manuals, guarantee documents and any commissioning or building-regulations paperwork. If something is missing, ask for it in writing that day.

2. Record the make, model and serial numbers

Photograph the data plate on a new boiler, cylinder, heating control or ventilation unit, and write down the manufacturer, model and serial number. Keep those photos with the pack. They are needed if you later claim on a warranty or book a service.

3. Read what each guarantee actually covers

Installer workmanship guarantees and manufacturer product warranties are not the same thing. Note how many years each runs for, what is included (parts, labour, call-outs) and what would cancel the cover, such as a missed service. Ask who to contact first if something fails.

4. Register any manufacturer warranty if you are asked to

Some manufacturers ask the householder or installer to register the product. Check whether this was done for you and keep the confirmation email or reference. If you are expected to register it yourself, do it promptly and store the confirmation with the pack.

5. Keep building-regulations and commissioning documents

A replacement boiler usually needs a commissioning record and notification to building control or a competent-person scheme. Insulation work should also leave a record of what was installed. These papers matter if you sell the home or if a later surveyor asks what was done.

6. Ask for a demonstration, not just a leaflet

Have someone show you how to use the new boiler controls, programmers, TRVs, extract fans or ventilation settings. Write the normal settings down. If a relative will use the heating when you are out, include them in the demonstration if you can.

7. Note any snagging and get a completion date

If paintwork, boxing, a leftover hole, an unlabelled control or a radiator that will not heat was left unfinished, list it and ask when it will be put right. Keep that list with names and dates.

8. Know who to call if something goes wrong

Write down the installer's out-of-hours number, the ordinary office number and, for gas appliances, how to report a smell of gas (use the national gas emergency number). Do not wait if you think something is unsafe.

9. Compare local delivery data

See ECO measures by council on ApplyFreeBoiler.uk, built from DESNZ Household Energy Efficiency statistics, to see how many ECO measures have been installed in your local authority area.

10. Check eligibility

Use the ApplyFreeBoiler.uk eligibility check to see whether an ECO4 heating or insulation pathway may be available for your home in England, Scotland or Wales. ECO4 is due to close on 31 December 2026.