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HEAT LOSS HUB · TOOLBOX
Heat Loss Hub Toolbox
Free heating and heat pump tools
Use the Heat Loss Hub Toolbox to carry out quick heating calculations, check radiator performance and understand some of the figures used when designing low-temperature heating and heat pump systems.
These tools are designed to make common calculations quicker and easier for homeowners, installers and heating professionals.
Radiator Output Calculator
Estimate how the output of an existing radiator changes when operating at different flow and return temperatures. Particularly useful when considering lower-temperature heating systems and heat pumps.
Open Radiator CalculatorMass Flow Rate Calculator
Explore the relationship between heat output, water flow rate and temperature difference using the Heat Loss Hub Mass Flow Rate Triangle.
Open Mass Flow Rate CalculatorBuffer Flow Visualiser
See how mismatched primary and heating flow rates move water vertically through a four-pipe buffer, and how that blending changes flow and return temperatures.
Open Buffer Flow VisualiserCylinder Reheat Calculator
Estimate how long a heat pump will take to reheat a hot water cylinder from its volume, start and target temperatures and the heat output actually available.
Open Cylinder Reheat CalculatorInteractive Heat Pump Simulator
Watch an air source heat pump run. Follow the refrigerant through each component, change the operating conditions and trigger a defrost cycle.
Open the Simulator