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3 port Valves

All good heat pumps will be able to cover both heating and hot water. A very good heat pump will always allow for hot water priority, meaning when the hot water temperature drops, despite there being a demand for heating, the heat pump will stop heating the building and regenerate hot water. 3 port valve

3 port valve To do this then the heat pump will need either 2 sets of zone valves (one hot water and one heating) or more commonly a 3 port diverting valve. This will either divert flow on the flow or the return to either the hot water cylinder and the heat distribution of the building.

3 port valves come in all shapes and sizes, some more reliable than others. Commonly they give trouble in the following heat pumps:


  • Nibe 
  • Thermia
  • Danfoss
  • IVT
  • Bosch

A typical heat pump will spend 80-90% of it’s time doing heating and 10-20% of the time doing hot water. This will vary from heat pump to heat pump and varies on installations. If however you find that your heat pump running a lot on hot water and that you may have hot water running hours over 30% then you may have an issue with your 3 port valve.

3 Port Valve




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