A long warranty headline can hide narrow cover. Heat battery projects combine a product, controls, plumbing and electrical installation, often supplied by more than one business.
The short answer
Get the full terms before paying. Identify who covers the storage unit, workmanship and third-party components, who attends first and which costs remain yours.
Read the boundaries
Check start date, registration deadline, covered parts, performance threshold, labour, travel, call-out charges and removal or access costs. Note servicing and connectivity requirements.
Installer versus maker
The maker may warrant the product while the installer covers workmanship. Ask what happens when each blames the other and whether an approved service partner can diagnose the complete system.
If a business stops trading
Find out whether cover is insurance-backed, tied to the original installer or available through another approved firm. A parts-only promise is less useful if no local technician will fit the part.
Transfer to a buyer
Check whether the warranty follows the property, requires a transfer fee or ends when ownership changes. Keep login and registration details out of personal accounts where possible.
Software and cloud controls
Ask whether the appliance keeps basic heating and hot water if an app, subscription or cloud service ends.
Your next step
Write a single support scenario—“no hot water on a winter Saturday”—and ask each bidder who you call, expected response, and which costs are covered.
Sources
Primary and independent references checked by our editorial team.
- Before you get work done on your home — Citizens Advice Checked 10 Nov 2026