Improve efficiency by setting the correct flow temperature
The Heating Flow Temperature Optimiser helps you identify the most efficient flow temperature for your heating system. Flow temperature—the temperature of water leaving your boiler or heat pump—has a major impact on energy efficiency, running costs, and system lifespan.
By optimising this setting, you can reduce energy use while maintaining comfortable indoor temperatures.
Heating flow temperature is the temperature at which heated water is delivered from the boiler or heat pump to radiators or underfloor heating.
Typical ranges:
Radiators (traditional systems): 60–75°C
Modern condensing boilers: 50–65°C
Heat pumps & underfloor heating: 30–45°C
Lower flow temperatures generally improve efficiency—especially for condensing boilers and heat pumps.
The optimiser evaluates your system characteristics to recommend an efficient flow temperature.
You may be asked to enter:
Heating system type (boiler or heat pump)
Radiator or emitter size
Property insulation level
Outdoor temperature or climate zone
The tool then provides:
A recommended flow temperature range
Efficiency improvement guidance
Warnings if current settings are too high or too low
Correct flow temperature helps:
Reduce fuel or electricity consumption
Improve condensing efficiency (boilers)
Increase heat pump COP
Reduce system cycling
Extend equipment lifespan
Many systems operate at unnecessarily high temperatures, wasting energy.
The Heating Flow Temperature Optimiser is ideal for:
Homeowners
Landlords and property managers
Heating engineers and installers
Heat pump users
Energy efficiency assessors
Reduced efficiency
Higher energy bills
Increased wear on components
Rooms not reaching target temperature
Longer warm-up times
User discomfort
Lower temperatures allow the boiler to condense more often, increasing efficiency.
Flow temperature has a direct effect on COP—lower temperatures significantly reduce running costs.
Designed to operate at low flow temperatures, maximising efficiency and comfort.
It depends on system type and heat demand. Lower is better, provided your home stays warm.
In many systems, yes. Changes should be made gradually while monitoring comfort.
Yes. Even small reductions can lead to noticeable energy savings.
No, as long as the system is correctly designed and balanced.
Yes. Weather compensation controls automatically adjust flow temperature based on outdoor conditions.
Lower flow temperature gradually
Balance radiators properly
Improve insulation and draught-proofing
Use weather compensation
Monitor indoor temperatures
This tool provides guidance only. Actual system performance depends on installation quality, heat demand, and controls. Always follow manufacturer recommendations and seek professional advice where necessary.
The Heating Flow Temperature Optimiser is a powerful tool for improving heating efficiency without costly upgrades. By finding the optimal flow temperature for your system, you can reduce energy bills, improve comfort, and extend the life of your heating equipment.
Use this optimiser as part of a smart, energy-efficient heating strategy.