ᐅ General contractor recommends combined storage tank with buffer for underfloor heating – what to do?
Created on: 25 Oct 2021 17:10
B
BananaJoeB
BananaJoe25 Oct 2021 17:10Hello everyone,
I have a problem I’d like to discuss:
For our new build (2 full floors, no basement, approximately 175 m² (1,884 ft²) of heated living space), the following components were originally planned:
- Stiebel Eltron WPL 13 ACS heat pump
- Hydraulics module HM Trend
- Stiebel Eltron SBBE 301 heat pump domestic hot water tank (300 liters (79 gallons), domestic hot water only, no buffer tank)
The underfloor heating was planned and installed based on this setup. The heat pump outdoor unit and the hydraulics module have already been delivered, installed, and connected to the underfloor heating.
Now the general contractor informs me that Stiebel Eltron has apparently discontinued the domestic hot water tank and no devices are available in stock—checking SE’s website confirms this, as the unit can no longer be found there.
As an alternative, the Stiebel Eltron integral tank HSBC 300 L cool is now being proposed. In my view, the main differences between the two (first value = SBBE 301, second value = HSBC 300) are:
Nominal volume domestic hot water tank: 319 liters (84 gallons) vs. 291 liters (77 gallons)
Nominal volume buffer tank: none vs. 100 liters (26 gallons)
Standby energy consumption (24h at 65°C (149°F)): 1.2 kWh (efficiency class A) vs. 1.5 kWh (efficiency class B)
Since I researched the topic of underfloor heating design in detail before building the house, I paid special attention to selecting components without an integrated buffer tank. The underfloor heating system was planned based on that assumption (by an engineering company, which I believe was recommended here in the forum). Now I’m wondering:
1. Is it possible to combine the Stiebel Eltron components (heat pump, hydraulics module) with a domestic hot water tank from another manufacturer? If so, how can I tell if a device from a different provider is compatible?
2. Could the "previous version" of the SBBE 301, the SBB 300-1, be an alternative without a buffer tank? However, judging by its appearance, it looks rather outdated technically and also has even higher standby energy consumption at 1.7 kWh than the HSBC 300 suggested by the contractor.
3. How problematic is the buffer tank in practice? More specifically, what approximate additional annual costs should one expect (if this can even be reasonably estimated)?
Many thanks in advance for all your answers!
I have a problem I’d like to discuss:
For our new build (2 full floors, no basement, approximately 175 m² (1,884 ft²) of heated living space), the following components were originally planned:
- Stiebel Eltron WPL 13 ACS heat pump
- Hydraulics module HM Trend
- Stiebel Eltron SBBE 301 heat pump domestic hot water tank (300 liters (79 gallons), domestic hot water only, no buffer tank)
The underfloor heating was planned and installed based on this setup. The heat pump outdoor unit and the hydraulics module have already been delivered, installed, and connected to the underfloor heating.
Now the general contractor informs me that Stiebel Eltron has apparently discontinued the domestic hot water tank and no devices are available in stock—checking SE’s website confirms this, as the unit can no longer be found there.
As an alternative, the Stiebel Eltron integral tank HSBC 300 L cool is now being proposed. In my view, the main differences between the two (first value = SBBE 301, second value = HSBC 300) are:
Nominal volume domestic hot water tank: 319 liters (84 gallons) vs. 291 liters (77 gallons)
Nominal volume buffer tank: none vs. 100 liters (26 gallons)
Standby energy consumption (24h at 65°C (149°F)): 1.2 kWh (efficiency class A) vs. 1.5 kWh (efficiency class B)
Since I researched the topic of underfloor heating design in detail before building the house, I paid special attention to selecting components without an integrated buffer tank. The underfloor heating system was planned based on that assumption (by an engineering company, which I believe was recommended here in the forum). Now I’m wondering:
1. Is it possible to combine the Stiebel Eltron components (heat pump, hydraulics module) with a domestic hot water tank from another manufacturer? If so, how can I tell if a device from a different provider is compatible?
2. Could the "previous version" of the SBBE 301, the SBB 300-1, be an alternative without a buffer tank? However, judging by its appearance, it looks rather outdated technically and also has even higher standby energy consumption at 1.7 kWh than the HSBC 300 suggested by the contractor.
3. How problematic is the buffer tank in practice? More specifically, what approximate additional annual costs should one expect (if this can even be reasonably estimated)?
Many thanks in advance for all your answers!
Similar topics