If you have an existing heater (eg gas, oil, electric etc), then we recommend that you install the heat pump alongside your existing heater.
This will allow you to run both the heat pump and the existing heater if required for a rapid pool heat up, or to provide a backup heater in case the heat pump develops a fault (unlikely). You can also switch to your existing heater when the air temperature becomes too cold for the heat pump to operate efficiently eg right at the end of the season.
If you want to install the heat pump alongside your existing heater, then the water should flow through the heat pump and then the existing heater before returning to the pool for maximum efficiency
