We recently purchased an existing condominium in a six-family house that was completed in December 2014.
The building has a total enclosed volume of 3,114 cubic meters (cbm), with a total living area of just under 640 square meters (sqm). Installed is an air-to-water heat pump Stiebel Eltron WPL 33 HT with the hot water storage tank SBB 1000 Wärmepumpe SOL. The heating capacity is specified as 12.38 kW at A -7/W35 and 7.45 kW at A2/W35 partial load. I am not an expert and find these figures difficult to interpret; so far, I have found little clarifying information online.
The electricity consumption for the entire building in 2016 was extremely high at 30,360 kWh (equal to 7,650 euros). Could it be that the system was significantly undersized and therefore has to run constantly? According to the seller, the construction company had to install a slope stabilization afterwards at a six-figure cost. I wouldn’t be surprised if savings were made elsewhere...
On the Stiebel Eltron website, when selecting options for new builds over 240 sqm (about 2,583 sqft), the above-mentioned pump is not recommended. This might be an initial indication of a non-ideal configuration.
In my opinion, the rental costs for various heat meters are also disproportionately high. Is it possible to replace them with individual meters, and what would the cost be? An air-to-water heat pump is supposed to be very low-maintenance. Are maintenance costs of 672 euros reasonable?
Thank you in advance for your expert feedback.
The building has a total enclosed volume of 3,114 cubic meters (cbm), with a total living area of just under 640 square meters (sqm). Installed is an air-to-water heat pump Stiebel Eltron WPL 33 HT with the hot water storage tank SBB 1000 Wärmepumpe SOL. The heating capacity is specified as 12.38 kW at A -7/W35 and 7.45 kW at A2/W35 partial load. I am not an expert and find these figures difficult to interpret; so far, I have found little clarifying information online.
The electricity consumption for the entire building in 2016 was extremely high at 30,360 kWh (equal to 7,650 euros). Could it be that the system was significantly undersized and therefore has to run constantly? According to the seller, the construction company had to install a slope stabilization afterwards at a six-figure cost. I wouldn’t be surprised if savings were made elsewhere...
On the Stiebel Eltron website, when selecting options for new builds over 240 sqm (about 2,583 sqft), the above-mentioned pump is not recommended. This might be an initial indication of a non-ideal configuration.
In my opinion, the rental costs for various heat meters are also disproportionately high. Is it possible to replace them with individual meters, and what would the cost be? An air-to-water heat pump is supposed to be very low-maintenance. Are maintenance costs of 672 euros reasonable?
Thank you in advance for your expert feedback.
The manufacturer of the air-to-water heat pump has meanwhile stated that the heat demand of 30 MWh from the preliminary calculation corresponds to the planning estimates. It remains unclear whether this figure refers to the total heat demand of the building – including the heating energy generated by the heat pump from air and water – or whether the 30 MWh is meant to represent the net electricity consumption calculated for the operation.
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