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peterbocholt29 Oct 2014 12:17Hello forum community,
My wife and I are planning an extension to our home and are currently considering the possible heating options.
Just to explain, we are extending an existing house (built in 1975). My parents-in-law live on the ground floor, and we live upstairs. The entire building’s existing heating system (storage heaters) and hot water supply will be renewed. It is already decided that we will not install underfloor heating, and that heating and hot water will be produced centrally. The windows and insulation are all up to modern standards.
One option would be a gas boiler, but the question is how expensive the gas connection would be. For a heat pump, only an air-source heat pump would be possible because we don’t have enough space on the property for ground-source heating.
I am somewhat skeptical about air-source heat pumps. From what I understand, heating is not a problem, and hot water for showering or similar purposes up to 40°C (104°F) should still be energy-efficient. But what about the kitchen sink, where you sometimes need really hot water? To avoid constantly heating the entire hot water system to 60°C (140°F) just for the sink, I had the idea of installing an instantaneous water heater under the kitchen sink, connected to the hot water line coming from the central heating system. This way, you would have hot water immediately without delay, and since the water is preheated to 40°C (104°F), the instantaneous heater would only need to raise the temperature by about 20°C (36°F) from 40°C to 60°C.
Would that work?
How practical would it be?
Do you have any other ideas?
Thank you,
Peter
My wife and I are planning an extension to our home and are currently considering the possible heating options.
Just to explain, we are extending an existing house (built in 1975). My parents-in-law live on the ground floor, and we live upstairs. The entire building’s existing heating system (storage heaters) and hot water supply will be renewed. It is already decided that we will not install underfloor heating, and that heating and hot water will be produced centrally. The windows and insulation are all up to modern standards.
One option would be a gas boiler, but the question is how expensive the gas connection would be. For a heat pump, only an air-source heat pump would be possible because we don’t have enough space on the property for ground-source heating.
I am somewhat skeptical about air-source heat pumps. From what I understand, heating is not a problem, and hot water for showering or similar purposes up to 40°C (104°F) should still be energy-efficient. But what about the kitchen sink, where you sometimes need really hot water? To avoid constantly heating the entire hot water system to 60°C (140°F) just for the sink, I had the idea of installing an instantaneous water heater under the kitchen sink, connected to the hot water line coming from the central heating system. This way, you would have hot water immediately without delay, and since the water is preheated to 40°C (104°F), the instantaneous heater would only need to raise the temperature by about 20°C (36°F) from 40°C to 60°C.
Would that work?
How practical would it be?
Do you have any other ideas?
Thank you,
Peter
Why do you need 60°C (140°F) in the kitchen sink?
We manage well with 40°C (104°F) – most dishes end up in the dishwasher anyway. If you have an instantaneous water heater, you would need to install a circulation line to get hot water immediately. With a heat pump, that hardly makes sense. In other words: when you turn on the tap, cold water comes through first until the warm water arrives. Then the instantaneous heater has to raise the temperature from 10°C (50°F) to 60°C (140°F). But again: what’s the point of all this?
We manage well with 40°C (104°F) – most dishes end up in the dishwasher anyway. If you have an instantaneous water heater, you would need to install a circulation line to get hot water immediately. With a heat pump, that hardly makes sense. In other words: when you turn on the tap, cold water comes through first until the warm water arrives. Then the instantaneous heater has to raise the temperature from 10°C (50°F) to 60°C (140°F). But again: what’s the point of all this?
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Bauabenteurer29 Oct 2014 13:06Wastl schrieb:
Why do you need 60 degrees in the kitchen sink? QUOTE]
It is recommended (keyword: Legionella).Bauabenteurer schrieb:
It is recommended (keyword: Legionella).There are various recommendations. Legionella bacteria typically develop only in pipe lengths over 20 meters (65.6 feet) or in the tank, and so on. My heating system runs an automatic monthly Legionella program and heats the tank through to kill all bacteria.
BUT: Why exactly do you need 60°C (140°F) at the kitchen sink? Legionella can form in any pipe (including in the bathroom),...
Otherwise, all heat pump owners would have Legionella in their homes,...
Have you ever looked into Legionella more closely? You don’t get Legionella from drinking water or washing your hands. You get it by inhaling water vapor—most commonly in the shower. For that reason, having an instant water heater in the kitchen doesn’t make much sense at all.
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peterbocholt29 Oct 2014 21:21I wasn't concerned about legionella.... Just about washing off greasy residue.....
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