ᐅ Gas condensing boiler technology combined with a solar thermal system
Created on: 25 May 2014 19:45
F
Frischluft01
Hello, our builder is offering a gas condensing boiler system (Viessmann Vitodens 200W) combined with a solar thermal system (Vitosol 200F with a 300-liter (79 gallons) hot water storage tank).
Is this combination necessary or efficient? We are a household of three; wouldn’t a 150-liter (40 gallons) storage tank be sufficient?
Single-family house, underfloor heating on the ground and upper floors, 125 square meters (1,345 square feet) of living space, mechanical ventilation with heat recovery.
As an alternative, he is offering an air-to-water heat pump installed indoors, also with a 300-liter (79 gallons) storage tank.
Best regards
Is this combination necessary or efficient? We are a household of three; wouldn’t a 150-liter (40 gallons) storage tank be sufficient?
Single-family house, underfloor heating on the ground and upper floors, 125 square meters (1,345 square feet) of living space, mechanical ventilation with heat recovery.
As an alternative, he is offering an air-to-water heat pump installed indoors, also with a 300-liter (79 gallons) storage tank.
Best regards
Hi
We had planned the same combination. Because of the small utility room, the builder recommended the Vitodens 343, since the storage tank and heater are combined in one unit. Unfortunately, the storage tank is only 220 liters (58 gallons), but with just two people in the household and only a shower bathroom, I don’t see a problem.
If there is enough space, and if more people might want to take baths as well, the storage tank can never be too large.
Layered storage tanks are often used when combining two heat sources, in this case gas and solar. The more expensive source only heats the upper part of the tank as needed when the cheaper source can’t provide enough heat. This way, only part of the tank is warmed at a higher cost. Since the hot water is drawn from the top of the tank, there is no loss of comfort.
The cheaper heat source, on the other hand, is supposed to heat the entire tank and therefore has its heat exchanger at the bottom. Ideally, the whole tank reaches the desired temperature or higher and can be used without activating the more expensive heat source.
The larger the tank, the better this system works.
We had planned the same combination. Because of the small utility room, the builder recommended the Vitodens 343, since the storage tank and heater are combined in one unit. Unfortunately, the storage tank is only 220 liters (58 gallons), but with just two people in the household and only a shower bathroom, I don’t see a problem.
If there is enough space, and if more people might want to take baths as well, the storage tank can never be too large.
Layered storage tanks are often used when combining two heat sources, in this case gas and solar. The more expensive source only heats the upper part of the tank as needed when the cheaper source can’t provide enough heat. This way, only part of the tank is warmed at a higher cost. Since the hot water is drawn from the top of the tank, there is no loss of comfort.
The cheaper heat source, on the other hand, is supposed to heat the entire tank and therefore has its heat exchanger at the bottom. Ideally, the whole tank reaches the desired temperature or higher and can be used without activating the more expensive heat source.
The larger the tank, the better this system works.
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