Air Source Heat Pumps (ASHPs) are an energy-efficient and eco-friendly way to heat your home, but many homeowners wonder whether they need underfloor heating for them to work effectively. While underfloor heating is often recommended alongside heat pumps, it’s not always necessary.
In this guide, we’ll explain how ASHPs work with different heating systems, whether underfloor heating is the best option, and what to consider if you plan to stick with radiators instead.
1. Do Air Source Heat Pumps Work Best with Underfloor Heating?
Underfloor heating is often the ideal companion for an air source heat pump, but it’s not essential. The reason they work well together comes down to how heat pumps operate.
Unlike gas boilers, which produce high-temperature heat, ASHPs work at lower temperatures over a longer period. This means they are most effective when paired with a heating system that can distribute warmth evenly and efficiently—which is exactly what underfloor heating does.
Why Underfloor Heating Pairs Well with ASHPs:
✅ Larger surface area for heat distribution – Covers the entire floor, meaning heat is spread more evenly than radiators.
✅ Lower water temperature needed – Underfloor heating works efficiently at 35-45°C, which matches an ASHP’s ideal output range.
✅ Consistent, comfortable warmth – No cold spots, as heat rises gently across the room.
✅ More energy-efficient – Because it requires lower temperatures, it allows the heat pump to work at its most efficient level, reducing energy bills.
However, just because underfloor heating is a good option, that doesn’t mean you can’t use a heat pump with radiators.
2. Can You Use an Air Source Heat Pump with Radiators?
Yes! Air Source Heat Pumps work with both underfloor heating and radiators, but you may need to make some adjustments to ensure efficiency.
What to Consider When Using Radiators with an ASHP:
✅ Upgrading to larger, low-flow radiators
- Standard radiators are designed for high-temperature systems like gas boilers, often running at 60-80°C.
- ASHPs operate at 40-55°C, so larger, high-efficiency radiators are better at distributing heat.
✅ Double-panel or aluminium radiators work best
- Double-panel (also called ‘double convector’) radiators provide a greater surface area, helping to compensate for the lower flow temperature.
- Aluminium radiators heat up faster and distribute warmth more efficiently.
✅ Ensuring your home is well insulated
- Heat pumps work most efficiently in well-insulated homes.
- If heat escapes quickly, radiators will struggle to keep the house warm. Upgrading insulation can help reduce heat loss and improve efficiency.
✅ Running your heating for longer at lower temperatures
- Unlike boilers, which blast heat in short bursts, heat pumps work best at a steady, lower temperature over a longer period.
- If you’re using radiators, you may need to keep your heating on for longer to maintain a comfortable temperature.
3. Underfloor Heating vs. Radiators: Which is Right for You?
If you’re deciding between underfloor heating and radiators, consider the pros and cons of each system:
| Feature | Underfloor Heating | Radiators |
| Efficiency with ASHP | ✅ Highly efficient at low temperatures | ⚠️ Requires larger radiators for best efficiency |
| Installation Cost | ⚠️ Higher upfront cost, especially for retrofits | ✅ Lower cost, unless upgrading to larger radiators |
| Heat Distribution | ✅ Even warmth across the whole room | ⚠️ Localised heat, may cause cold spots |
| Aesthetics & Space | ✅ No visible units, freeing up wall space | ⚠️ Takes up wall space and may not suit modern interiors |
| Response Time | ⚠️ Slower to heat up | ✅ Faster heat-up time |
If you’re renovating or building a new home, underfloor heating is an excellent long-term investment that will make your heat pump run as efficiently as possible. However, if you already have radiators, you don’t necessarily need to replace them—just ensure they are the right size and type for a heat pump system.
4. What If You Want a Mix of Both?
Many homeowners combine underfloor heating downstairs with radiators upstairs. This can be a great balance between cost and efficiency, allowing the main living areas to benefit from underfloor heating while keeping existing radiators in bedrooms and hallways.
5. Key Takeaways: Do You Need Underfloor Heating for an ASHP?
🚫 No, underfloor heating is not essential, but it helps improve efficiency.
✅ Radiators can work well with an ASHP, but they may need to be upgraded.
🏡 If your home is well-insulated, an ASHP will perform better, no matter which heating system you choose.
💰 If budget allows, underfloor heating is a great investment for long-term efficiency and comfort.
Thinking About an Air Source Heat Pump?
If you’re considering installing an ASHP and want expert advice on whether underfloor heating or radiators are best for your home, we can help!
At NCS, we offer top-quality Air Source Heat Pumps with expert installation to ensure maximum efficiency for your heating system. Get in touch today to find the perfect setup for your home!
