More and more houses are getting a heat pump. Here are the insulation classes from table 6.4 of DS 452 for the heat pump's warm and cold connecting pipes, ground source heating and solar heating — and why the cold pipes must be insulated against condensation.
The heat pumps are coming
The chart shows what share of residential buildings from each decade have a heat pump. Notice the shape: the oldest and the newest houses most often have a heat pump, and houses from the mid-1900s least often. That is where the next conversions come, and every new heat pump has pipes that must be insulated.
The classes for the heat pump's pipes
| System and pipes | Outdoors, in the ground or unheated (≤ 5 °C) | Heated room (> 5 °C) |
|---|---|---|
| Air-to-water and air-to-air: warm connecting pipes to the outdoor unit | Cl. 6 | Cl. 5 |
| Air-to-water and air-to-air: cold connecting pipes to the outdoor unit | Cl. 0 (k) | Cl. 4 (k) |
| Ground source heating: pipes with electric trace heating above 0 °C | Cl. 2 | — |
| Ground source heating: ground loops | In the ground: see note 4 | Cl. 4 (k) |
| Solar heating: pipes to solar collectors | Cl. 4 | Cl. 4 |
| Solar heating: tanks | Cl. 6 | Cl. 5 |
(k) means note 3: «Insulate against condensation according to conditions». Note 4 for ground loops in the ground refers to the Ministry of Environment's executive order on ground source heat systems (BEK no. 240 of 27/02/2017).
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