This is currently what my heating engineer is suggesting in combination with the existing pellet heating system, but I somehow can’t make sense of the fresh water station.
Originally, domestic hot water was produced using a separate hot water storage tank combined with an air-source heat pump for warm water exhaust, together with the photovoltaic system.
For a single-person household, all of this seems quite excessive to me.
With the fresh water station, I imagine that I would constantly need to keep the 500 liters (130 gallons) in the buffer tank at 45-55°C (113-131°F) to ensure that 30 liters (8 gallons) of hot water can be drawn on demand through the fresh water station. Even if electricity from the photovoltaic system is fed into the buffer tank via an electric heating element, there are still 500 liters (130 gallons) that need to be kept warm, right?
On the other hand, if I consider an 80-120 liter (21-32 gallons) hot water storage tank heated from the grid and/or photovoltaic system, only 80-120 liters (21-32 gallons) need to be heated.
Or am I misunderstanding the energy consumption of the fresh water station, and is my assumption incorrect because water is only drawn as needed?
Originally, domestic hot water was produced using a separate hot water storage tank combined with an air-source heat pump for warm water exhaust, together with the photovoltaic system.
For a single-person household, all of this seems quite excessive to me.
With the fresh water station, I imagine that I would constantly need to keep the 500 liters (130 gallons) in the buffer tank at 45-55°C (113-131°F) to ensure that 30 liters (8 gallons) of hot water can be drawn on demand through the fresh water station. Even if electricity from the photovoltaic system is fed into the buffer tank via an electric heating element, there are still 500 liters (130 gallons) that need to be kept warm, right?
On the other hand, if I consider an 80-120 liter (21-32 gallons) hot water storage tank heated from the grid and/or photovoltaic system, only 80-120 liters (21-32 gallons) need to be heated.
Or am I misunderstanding the energy consumption of the fresh water station, and is my assumption incorrect because water is only drawn as needed?
D
Deliverer9 Apr 2022 17:34No, you are probably right.
Maybe consider a domestic hot water heat pump? An additional benefit would be that you wouldn't need to start the pellet boiler in summer, which isn’t worth it for such small tanks and probably consumes as much electricity as the entire water heating with the heat pump. This way, the heating system also lasts longer. And a budget model should cost less than the direct fresh water system.
Maybe consider a domestic hot water heat pump? An additional benefit would be that you wouldn't need to start the pellet boiler in summer, which isn’t worth it for such small tanks and probably consumes as much electricity as the entire water heating with the heat pump. This way, the heating system also lasts longer. And a budget model should cost less than the direct fresh water system.
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