Hello everyone,
I have the following description from the general contractor. I notice that the domestic hot water storage tank is much smaller than in other examples here in the forum. Does this make sense?
Are there any experiences with this type of unit(s)?
Is a circulation system necessary?
Which screed is recommended for underfloor heating?
(About the house: 166 m² (1786 sq ft), approx. 9 x 11 m (30 x 36 ft), KFW 55)
Heating system
Vaillant system:
Gas condensing boiler with integrated solar system according to DIN/EN 677, auroCOMPACT series in compliance with the energy saving regulation, featuring a stainless steel heat exchanger. Rated heating output is approximately 3.3 to 14.7 kW. Depending on the outdoor temperature, a weather-compensated solar system controller type multiMATIC regulates the temperature level. Heating cycles and domestic hot water production can be programmed individually via a timer.
Air/exhaust system:
The air/exhaust system for the sealed combustion condensing units is a concentric air/flue pipe system routed through the roof.
Domestic hot water
Vaillant system:
The house’s domestic hot water supply is central without circulation pipes. For supplying the bathroom, guest toilet, and kitchen, the described gas condensing boiler with integrated 190 L (50 US gallons) stratified hot water storage tank is combined with three system-matched flat-plate solar collectors of type auroTHERM VFK 145 V/H, mounted on the roof with a total collector area of about 7.5 m² (81 sq ft). A thermostatic mixing valve is provisioned to prevent scalding.
Underfloor heating:
Warm water underfloor heating designed based on heating demand calculation, using plastic piping on insulation boards with room temperature control (surface-mounted thermostat).
Depending on the contractor’s choice, either a cement or anhydrite screed will be installed.
One heating circuit manifold per floor is planned, which will be installed flush with the wall.
Thank you,
h4nnes
I have the following description from the general contractor. I notice that the domestic hot water storage tank is much smaller than in other examples here in the forum. Does this make sense?
Are there any experiences with this type of unit(s)?
Is a circulation system necessary?
Which screed is recommended for underfloor heating?
(About the house: 166 m² (1786 sq ft), approx. 9 x 11 m (30 x 36 ft), KFW 55)
Heating system
Vaillant system:
Gas condensing boiler with integrated solar system according to DIN/EN 677, auroCOMPACT series in compliance with the energy saving regulation, featuring a stainless steel heat exchanger. Rated heating output is approximately 3.3 to 14.7 kW. Depending on the outdoor temperature, a weather-compensated solar system controller type multiMATIC regulates the temperature level. Heating cycles and domestic hot water production can be programmed individually via a timer.
Air/exhaust system:
The air/exhaust system for the sealed combustion condensing units is a concentric air/flue pipe system routed through the roof.
Domestic hot water
Vaillant system:
The house’s domestic hot water supply is central without circulation pipes. For supplying the bathroom, guest toilet, and kitchen, the described gas condensing boiler with integrated 190 L (50 US gallons) stratified hot water storage tank is combined with three system-matched flat-plate solar collectors of type auroTHERM VFK 145 V/H, mounted on the roof with a total collector area of about 7.5 m² (81 sq ft). A thermostatic mixing valve is provisioned to prevent scalding.
Underfloor heating:
Warm water underfloor heating designed based on heating demand calculation, using plastic piping on insulation boards with room temperature control (surface-mounted thermostat).
Depending on the contractor’s choice, either a cement or anhydrite screed will be installed.
One heating circuit manifold per floor is planned, which will be installed flush with the wall.
Thank you,
h4nnes
Grym schrieb:
We have gas heating WITHOUT solar, combined with the already desired controlled residential ventilation system with heat recovery. This means no additional costs for solar thermal systems, as well as no issues with scalding, maintenance of an unnecessary system, overheating in summer, and so on...This is a sensible but unfortunately far too rare combination. Gas with solar is often offered as a standard package, more or less pre-calculated. Quite a pity.Karsten, we mostly agree. The rest are nuances and partly guesswork. I have also now chosen gas for an existing building for various reasons.
Can anyone comment on the following points?
Are recirculation lines necessary? ("The domestic hot water supply of the house is central without recirculation lines.")
Which type of screed is used with underfloor heating? ("Depending on the contractor’s choice, either a cement or anhydrite screed will be installed.")
Are recirculation lines necessary? ("The domestic hot water supply of the house is central without recirculation lines.")
Which type of screed is used with underfloor heating? ("Depending on the contractor’s choice, either a cement or anhydrite screed will be installed.")
Grym schrieb:
We have gas WITHOUT solar and with the controlled ventilation system with heat recovery, which we wanted anyway. This way, there are no additional costs for solar thermal. Also, no issues like scalding, maintenance of an unnecessary system, overheating in summer, and so on...Hello Grym,
does that mean I won’t be able to achieve KFW 55 in my case?
2.) For the building services, one of the following six system concepts must be implemented. The location of the heat generator or heat transfer station must be within the building’s thermal envelope, and a central domestic hot water preparation must be provided. Domestic hot water circulation is permitted.
- Condensing boiler, solar domestic hot water preparation (standard values according to DIN V 4701-10), central ventilation system with heat recovery (heat provision efficiency > 80%)
- District heating with certified primary energy factor fp ≤ 0.7, central ventilation system with heat recovery (heat provision efficiency > 80%)
- Central biomass heating system based on wood pellets, wood chips, or firewood, central exhaust system
- Ground source heat pump with underfloor heating system for heat delivery, central exhaust system
- Water source heat pump with underfloor heating system for heat delivery, central exhaust system
- Air source heat pump with underfloor heating system for heat delivery, central ventilation system with heat recovery (heat provision efficiency > 80%)
Similar topics