Last year, my wife and I viewed four apartments in a block of apartments that had a district/community heating system. Each apartment therefore had a heat interface unit (HIU). It was my first experience of this type of heating and I had never seen an HIU before.
In each apartment that we viewed, I was aware of a hum in a certain area of that apartment and it appeared to be coming from the HIU. If I was not in the vicinity of the HIU, I could not hear the hum. My main query is, do all HIUs make a hum and, if so, what is causing it?
Secondary to the main question is the following. Can the volume of the hum be turned down in any way? Can an HIU be turned off completely if hot water and room heating are not required? If an HIU can be turned off, does the hum cease?
Finally, which is generally considered cheaper, hot water and room heating provided by a district/community heating system, or hot water and room heating provided by a gas boiler?
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In each apartment that we viewed, I was aware of a hum in a certain area of that apartment and it appeared to be coming from the HIU. If I was not in the vicinity of the HIU, I could not hear the hum. My main query is, do all HIUs make a hum and, if so, what is causing it?
Secondary to the main question is the following. Can the volume of the hum be turned down in any way? Can an HIU be turned off completely if hot water and room heating are not required? If an HIU can be turned off, does the hum cease?
Finally, which is generally considered cheaper, hot water and room heating provided by a district/community heating system, or hot water and room heating provided by a gas boiler?
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