Heat Pump Radiator Upgrade Costs UK 2026
Some homes need zero radiator changes for a heat pump. Others need several swapped out. The typical cost is £200-£500 per radiator, with a 3-bed semi averaging £800-£1,500 total. Understanding when and why radiators need upgrading helps you budget accurately and avoid being oversold unnecessary work.
For the full picture on whether your radiators need changing, see our dedicated radiator guide. For total installation costs, see our cost guide.
Get a quote that tells you exactly which radiators need upgrading
Get free quotesGood installers base radiator recommendations on room-by-room heat loss calculations, not guesswork.
Why Heat Pumps Sometimes Need Bigger Radiators
A gas boiler heats water to 65-75°C. A heat pump works best at 35-45°C. At lower temperatures, each radiator emits less heat. If a radiator was sized for 70°C, it may not provide enough at 45°C. The solution: a larger radiator or a different type. But not every radiator needs upgrading -- generously sized ones often cope fine.
Per-Radiator Costs
| Upgrade Type | Installed Cost |
|---|---|
| Standard upgrade (Type 22, 600x1200mm) | £200-£400 |
| Large upgrade (Type 22, 600x1600mm) | £280-£500 |
| Premium/designer radiator | £400-£1,000+ |
| Fan-assisted radiator | £300-£600 |
How Many Radiators Might Need Upgrading?
Total Radiator Upgrade Budgets
These costs are included in the overall installation -- see our cost guide and are covered by the BUS grant.
Find out if your radiators need upgrading
Check your home's suitabilityFree tool. Includes radiator assessment guidance.
How to Minimise Radiator Upgrade Costs
- Improve insulation first -- reduces heat output needed per radiator
- Accept slightly higher flow temperatures -- 45°C vs 35°C avoids some upgrades (costs ~£80-130/yr more)
- Phase upgrades -- install the heat pump first, upgrade only rooms that struggle
- Choose standard Type 22 radiators -- best value for heat output per pound
- Consider fan-assisted for problem rooms -- 2-3x output in the same space
Types of Radiators for Heat Pump Systems
Standard panel radiators (Type 22) are the default for most installations. Low-temperature radiators offer superior performance at 35-45°C. Underfloor heating operates at ideal temperatures (25-35°C) but is expensive to retrofit. Fan convectors are compact but produce slight noise. Your installer should consider all options. See our installation guide for more.
Frequently Asked Questions
How much does it cost to replace radiators for a heat pump?
£200-£500 per radiator. A 3-bed house typically needs 3-5 upgraded, costing £800-£2,000.
Do I definitely need new radiators?
Not necessarily. The heat loss calculation determines this. Our radiator guide explains in detail.
Can I keep existing radiators and run hotter?
Yes. Running at 50-55°C costs ~£150-£300/year more but may avoid £1,500+ in upgrades.
Do radiator upgrades qualify for the BUS grant?
Yes. They are part of the installation cost covered by the BUS grant.
Get a quote that includes accurate radiator assessment
Get free quotesMCS installers calculate radiator requirements room by room. No guesswork.
About this guide: This article covers radiator upgrade costs as part of heat pump installations. Radiator sizing is critical for air source heat pump efficiency. The BUS grant covers radiator upgrades as part of the installation. Homes with solar panels can offset the slightly higher running costs of higher flow temperatures if radiator upgrades are deferred.