ᐅ 190L vs. 309L Hot Water Storage Tank for a Household of Four People
Created on: 20 Apr 2022 08:06
S
Sinosch31
Good morning everyone!
We are currently contracting the heating and plumbing work for the construction of our single-family house (the shell is already underway). Here are some basic details about the building:
- 2 full floors, approximately 180 m² (170 m² (1,830 sq ft) living area, 10 m² (110 sq ft) utility room)
- no basement
- gable roof
- KFW 55 EE standard (including air-to-water heat pump, photovoltaic system)
- occupied by 2 adults and 1 child (eventually 2 children in total)
The plan is to install an air-to-water heat pump combined with a photovoltaic system and underfloor heating.
Provider A offers the following for the air-to-water heat pump:
Vaillant brand with a 190-liter (50-gallon) hot water tank plus all necessary accessories and installation for €28,560.00 net.
Provider B offers the following:
Weishaupt brand with a 309-liter (82-gallon) hot water tank plus all necessary accessories and installation for €22,628.20 net.
My question: Do you have any experience with the size of the hot water tank? Provider A says that 190 liters is sufficient for a 4-person household. It should be mentioned that we like to take longer showers, so we are not exactly the most economical in this regard.
Thank you in advance for your opinions and experiences.
We are currently contracting the heating and plumbing work for the construction of our single-family house (the shell is already underway). Here are some basic details about the building:
- 2 full floors, approximately 180 m² (170 m² (1,830 sq ft) living area, 10 m² (110 sq ft) utility room)
- no basement
- gable roof
- KFW 55 EE standard (including air-to-water heat pump, photovoltaic system)
- occupied by 2 adults and 1 child (eventually 2 children in total)
The plan is to install an air-to-water heat pump combined with a photovoltaic system and underfloor heating.
Provider A offers the following for the air-to-water heat pump:
Vaillant brand with a 190-liter (50-gallon) hot water tank plus all necessary accessories and installation for €28,560.00 net.
Provider B offers the following:
Weishaupt brand with a 309-liter (82-gallon) hot water tank plus all necessary accessories and installation for €22,628.20 net.
My question: Do you have any experience with the size of the hot water tank? Provider A says that 190 liters is sufficient for a 4-person household. It should be mentioned that we like to take longer showers, so we are not exactly the most economical in this regard.
Thank you in advance for your opinions and experiences.
HausiKlausi22 Apr 2022 00:00One more point: In addition to the arguments mentioned, the water storage tank can definitely be used to store excess photovoltaic power. My cousin deliberately uses it this way—he heats the domestic hot water significantly with the "excess peak." Therefore, in my opinion, it’s definitely worth opting for the larger storage tank!
Matthias45 schrieb:
I would also choose the option with the larger storage tank. Heating water with a heat pump is not as fast as with a gas boiler.
If several people shower one after another, there will be enough hot water available.
Heating 200 liters (53 gallons) can take up to 1 hour with an air-to-water heat pump. However, using a 300-liter (79 gallons) tank won’t make this process faster.
We have no issues with a 180-liter (47 gallons) integrated tank for four people (two of whom are still quite small). The tank is set to 47°C (117°F); if necessary, you can increase the temperature, but that will reduce efficiency.
Using excess photovoltaic energy to heat water is a good idea, but please avoid using an electric immersion heater for this. It would be a complete waste of money to convert the electricity directly into heat. It’s much better to use the heat pump for that purpose.
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