ᐅ Replacing an Old Heating System with a Heat Pump or Gas Boiler Combined with a Domestic Hot Water Heat Pump
Created on: 5 May 2022 10:01
G
GePrest
Hello, my gas heating system (roof heating central unit) is 22 years old, as is the solar thermal system. The solar thermal system is no longer functioning properly. The first builder recommends demolishing both the heating system and the solar thermal system and installing a Weishaupt heat pump. He has been installing only Weishaupt products for several years. A second builder recommends renewing the gas boiler and additionally installing a domestic hot water heat pump. A photovoltaic system has been commissioned with 9 Luxor ECO LINE HALF-CELLS M120/380W modules, which will be expanded by at least 3 modules when the solar thermal system is removed. The property is a mid-terrace house, fully equipped with radiators, with 106 m² (1,141 sq ft) of living space, housing 4 people, and approximately 10,000 kWh annual gas consumption. Postal code 76661, average annual temperature 11.1°C (52°F), standard outdoor temperature -10°C (14°F). According to the builder, the heat pump is to be installed on the roof. Regarding the hybrid system: can I install the heat pump for domestic hot water in the basement even though there is no existing hot water pipe? How extensive would the work be if additional piping needs to be installed? Installation in the attic is not possible.
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Deliverer24 May 2022 10:24GePrest schrieb:
What does heat pump design 55/45/21 degrees mean?I guess: supply temperature / return temperature / room temperatureThose values are pretty close to the worst-case scenario. ;-)
Deliverer schrieb:
I estimate: supply temperature / return temperature / room temperature.
Using values very close to the worst case. ;-)He is referring to the heat pump design. So it is probably not feasible to use the existing radiators efficiently, as the heat pump likely wouldn’t operate efficiently in that case. The options are either new radiators or a new gas boiler. Thanks for the information.D
Deliverer24 May 2022 11:06Without room-by-room heating load calculation, everything is just an estimate and not a proper “design.” I can also estimate that the supply temperature could be much lower.
Otherwise, 55°C (131°F) is barely acceptable. But every degree helps, and new radiators are probably worthwhile.
Edit: In my opinion, a “new gas boiler” is rather unlikely. You haven’t gained much if you have to replace it again in 10 years. TAKE the opportunity NOW to take advantage of the significant subsidies, upgrade the house to a better standard, and install a future-proof heating system. Currently, there is discussion about whether gas supplies can be cut off to private households “hour by hour,” or if that would be disproportionate. Despite reliance on Russian gas, it was almost impossible to keep the supply stable this winter... Also currently, plans for the phase-out of the gas network are underway. I have no idea what there is still to consider.
Otherwise, 55°C (131°F) is barely acceptable. But every degree helps, and new radiators are probably worthwhile.
Edit: In my opinion, a “new gas boiler” is rather unlikely. You haven’t gained much if you have to replace it again in 10 years. TAKE the opportunity NOW to take advantage of the significant subsidies, upgrade the house to a better standard, and install a future-proof heating system. Currently, there is discussion about whether gas supplies can be cut off to private households “hour by hour,” or if that would be disproportionate. Despite reliance on Russian gas, it was almost impossible to keep the supply stable this winter... Also currently, plans for the phase-out of the gas network are underway. I have no idea what there is still to consider.
Deliverer schrieb:
Without a room-by-room heating load calculation, everything is just an estimate and not a proper "design." And I can also estimate that the supply temperature could be much lower.
Otherwise: 55°C (131°F) is just about acceptable. But every degree counts, and new radiators are probably worth it.
Edit: In my opinion, a "new gas boiler" is rather unlikely. You don't gain much if you have to replace it again in 10 years. Take the opportunity NOW to take advantage of the significant subsidies, upgrade the house to a better standard, and install a future-proof heating system. Currently, there is discussion about whether gas supply to private households might be cut off "by the hour," or if that would be disproportionate. This winter, despite Russian gas, it was almost impossible to maintain stable supply... Also currently: planning for the phase-out of the gas network is underway. I have no idea what else there is to consider. 37,400 euros is quite a significant amount. What confuses me is the temperature details, even though 9 new radiators are included in the offer. The temperature should be much lower, right? The offer states: assumption of 110 m² (1,184 sq ft) living area with about 60 W/m² (20 BTU/ft²) design, 55/45/21°C (131/113/70°F).
I don’t quite understand that now. I also have a reduced offer with only one new radiator in the bathroom for about 29,700 plus crane and electrical work around 1,600, so a total of 31,300 including VAT. Still 6,100 cheaper. Offer valid until 31.05.2021 as prices are rising.
Deliverer schrieb:
Edit: In my opinion, a "new gas boiler" is probably not the best choice. You don’t gain much if you have to replace it again in 10 years. NOW is the chance to take advantage of the significant subsidies, upgrade the house to a better standard, and install a future-proof heating system. There is currently discussion about whether gas supply can be cut off to private households "by the hour," or if that would be disproportionate. This winter, despite Russian gas, it was almost impossible to maintain stable supply... Also, planning for the phase-out of the gas network is already underway. I have no idea what there still is to consider. I agree that heat pumps are the future, but do you have any facts to support your statements?
Where exactly is it stated that gas heating systems must be replaced in 10 years? So far, I only see ideas, and what is planned for 20 years from now will surely be changed multiple times. Without financial incentives, hardly anyone will be motivated to switch in 10 years either. After all, it doesn’t really matter if I give the money to my gas provider or to the bank (for a loan).
D
Deliverer24 May 2022 12:27What kind of facts do you want? Climate change? Paris Agreements? Federal Constitutional Court ruling? Replacing is not necessary. It’s a choice. Either for the children, the budget, or simply because you want heating.
Subsidies are only provided as long as they are needed, because the profitability of a decision is at stake. If the gas price remains this high, there will be no more debates about the cost-effectiveness of heat pumps. Then subsidies won’t be needed anymore either. But sure—you can always take a gamble. ;-)
Subsidies are only provided as long as they are needed, because the profitability of a decision is at stake. If the gas price remains this high, there will be no more debates about the cost-effectiveness of heat pumps. Then subsidies won’t be needed anymore either. But sure—you can always take a gamble. ;-)
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