Sometimes yes, but they may need to be larger. Heat pumps run at lower temperatures (35-55°C vs 70-80°C for boilers), so existing radiators often provide only 50% of their rated output. You may need to upgrade to larger radiators or add additional ones.

ΔT30 (Delta T 30) is a heat output rating measured at lower flow temperatures typical of heat pumps. Standard ΔT50 ratings assume 70°C water - unrealistic for heat pumps. Always use ΔT30 ratings when sizing radiators for heat pump systems.

Yes! Aluminium heats up 5x faster than steel, has lower water content, and responds quickly to temperature changes. This makes aluminium radiators ideal for heat pump systems which cycle on/off more frequently than boilers.

Calculate room heat loss (BTU) based on room size, insulation, and windows. For heat pumps, use ΔT30 ratings. As a rough guide: 150-200 BTU per m² for well-insulated rooms. Use our BTU calculator or contact us for a free sizing consultation.

Not necessarily. Start by calculating heat loss for each room and comparing with your existing radiators' ΔT30 output. Rooms with undersized radiators will need upgrading. Our team can help assess which radiators need replacing.

Most heat pumps work best at 35-45°C for maximum efficiency. Higher temperatures (up to 55°C) are possible but reduce efficiency. Size your radiators for 45°C flow to balance comfort and running costs.