Further Savings With Unique HGL Technology

A standard heat pump is designed to produce heating and hot water. Although it can’t produce both simultaneously, it can produce both sequentially with (in the case of IHS heat pumps) the hot water always taking priority. Any heat pump will be more efficient producing lower temperatures of warm water than high temperatures. This means that heat pumps are always less efficient producing hot water than they are low temperature heating systems, such as underfloor heating.

The HGL option however, offers a unique solution to this.
 
Unlike in a standard heat pump where a mixture of gases combines to output a single temperature, the HGL unit is able to extract two separate temperatures by using the lower temperature gas for the heating and the higher temperature gas for the hot water.  IDM HGL machines can produce hot water at a higher temperature at the same efficiency as the low temperature heat source.

It works like this.  The HGL has an additional heat exchanger on the heating output side.  This heat exchanger is able to extract the higher temperature gases to produce higher temperature hot water (eg 58˚C) at the same time as providing space heating at a lower flow temperature (eg 35˚C) by diverting 12% of the heat pump’s output to a separate heat exchanger. This allows the heat pump to trickle-charge the tank during heating times while still being capable of carrying out a conventional hot water cycle if required.  The result is that hotter water than normal is delivered at no additional cost.

HGL offers a further enhancement.   It can produce higher temperature hot water without affecting system efficiency.  The heat pump’s COP is increased because hot water is being produced at the same time as heat is being delivered.   

If you’d like to know more about HGL, please contact us and ask to speak with one of our design technicians.