Save money and space
One of the other appealing aspects of installing an inverter-driven unit is both the money and spatial requirements that can be saved by eliminating the need to fit a buffer tank or it can be much smaller if underfloor heating full zone control is used.
When installing a fixed output unit into a property, space needs to be left to install a buffer tank alongside it, approximately 15 litres per 1kW of heat pump capacity. The purpose of the buffer tank is to store pre-heated water in the system that is ready to be circulated around the central heating system on demand, limiting the on/off cycles.
For example, say you have a spare room in your home that you rarely use which is set to a lower temperature than other rooms in the house. But now you want to use that room and decide to turn up the thermostat. You adjust the temperature but now the heating system has to meet the new heat demand for that room.
We know that a fixed output heat pump can only run at maximum capacity, so it will begin to work at maximum capacity to meet what is actually a fraction of the maximum heat demand – wasting a lot of electrical energy. To bypass this, the buffer tank will send pre-heated water to the radiators or underfloor heating of the spare room to warm it up, and use the maximum output of the heat pump to re-heat the buffer tank and likely overheating of the buffer tank in the process ready for the next time it’s called upon.
With an inverter-driven unit installed, the heat pump will be adjusting itself to a lower output in the background and will recognise the change in demand and adjust its output according to the low change in water temperature. This capability, then, allows property owners to save on the money and space required to install a large buffer tank.
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