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
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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.
There is basically nothing wrong with that in principle. However, if you operate your heating system with a supply temperature of 50–60 degrees Celsius (122–140 degrees Fahrenheit), you will ruin the heat pump. If I were a car dealer, I would also bad-mouth your current ride.
You did not answer my question.
You did not answer my question.
Joedreck schrieb:
There is basically nothing wrong with that in principle. But if you operate your heating system with a flow temperature of 50-60 degrees Celsius (122-140 °F), you will ruin the heat pump.
If I were a car dealer, I would also badmouth your current ride.
You did not answer my question Domestic hot water through both. Could it be the circulation pump? Flow temperature about 40 degrees Celsius (104 °F).
Hot water is available, but it takes about 5 minutes to arrive. The simplest solution would be a new gas boiler. However, I would prefer to include at least a domestic hot water heat pump. The problem is that I can’t get it upstairs without significant effort (the stairway to the attic is only 55 cm (22 inches) wide). The boiler from Weishaupt would fit through the stairs, as would the domestic water tank from Weishaupt WAS Tower Eco with a diameter of 50 cm (20 inches). The domestic hot water heat pump would go in the basement. This setup would allow me to increase self-consumption of electricity from the future photovoltaic system. Would it then be necessary to install a hot water pipe? There is only a cold water connection in the basement.
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Deliverer5 May 2022 20:21All around me, functioning oil and gas heating systems are being removed (and replaced with heat pumps) because prices and supply situations are becoming increasingly critical. Additionally, all of Germany has only about 15 years left to replace all gas heating systems. Therefore, I can’t quite understand how anyone in 2022 would still consider gas when they have to replace their heating system anyway.
In my opinion, it’s a complete waste of money.
The heating load is low, and so is the external wall area. If the supply temperature is too high, it is possible (with good subsidies) to replace the radiators with more efficient ones. Install photovoltaic systems as large as possible. Nine panels sound like “only one side covered out of two.”
In my opinion, it’s a complete waste of money.
The heating load is low, and so is the external wall area. If the supply temperature is too high, it is possible (with good subsidies) to replace the radiators with more efficient ones. Install photovoltaic systems as large as possible. Nine panels sound like “only one side covered out of two.”
Deliverer schrieb:
All around me, functioning oil and gas heating systems are being removed (and replaced with heat pumps) because prices and supply situations are becoming increasingly critical. Additionally, all of Germany has only about 15 years left to replace all gas heating systems. Therefore, I find it hard to understand how, if you have to replace your heating system anyway, anyone in 2022 would still consider gas.
In my opinion, a complete waste of money.
The heating demand is low, and the exterior wall area is also small. If the supply temperature is too high, you can (with good subsidies) replace the radiators with more efficient ones. Solar PV systems should be as large as possible. Nine modules sound like "only one side of two is utilized." It’s also a financial issue. If there is no more gas, the only option left is a heat pump. Really mounting it on the pitched roof as the builder suggests? I’m open to other suggestions.
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