Modulating versions

Modulating air/water heat pump units are already available on the market. In order to use the advantages of this technology for geothermal heat pumps too, the new alterra series by alpha innotec now also includes a range of modulating ground source heat pumps. These are ideal for changing heat demand, as they provide the required reserves and are characterised by their particularly high efficiency (SCOP - seasonal performance factor).

The modulating systems adapt the heat generation to the respective current heat requirements of the building. Especially during the transition period between seasons, the building's demand can at times be far lower than the capacity of the heat pump.

As soon as an modulating heat pump receives a request for heat, the heat pump operates continuously with adapted output (compressor, fans and pumps) regardless of the building's needs; i.e. the heat pump does not switch on and off like a conventional heat pump, but instead gives off heat continuously based on demand. The result of this is improved seasonal performance factors and therefore increased efficiency. Modulating heat pumps are suitable for significantly smaller backup buffer tanks or can operate without buffer tank in case the quantity of circulating water in the heating system is sufficient.

The inverter-controlled units need a very low starting current. Therefore, in general, they can also be used in areas with grid operator restrictions, based on the maximum allowable starting current.