ᐅ Is a Gas Condensing Boiler a Practical Choice for New Single-Family Homes Under the 2016 Energy Saving Regulation?
Created on: 6 Jan 2019 13:18
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Bob79
Hello everyone,
we are planning to build a single-family house with underfloor heating (about 200 m² (2,150 sq ft) for 4 people). The energy standard will comply with the 2016 Energy Saving Ordinance, not a KfW standard. The walls will be made of thermal insulation bricks, 36.5 cm (14.4 inches) thick with a thermal conductivity (lambda) of 0.08, and triple glazing with a U-value of 0.8. The builder’s specifications include a gas condensing boiler (Vaillant ecoTecplus with a seasonal efficiency of 109%), a solar collector system (7.53 m² (81 sq ft)), and a combined storage tank (600/170 liters (158/45 gallons)). The builder recommends this setup. They advise against using a heat pump. However, I am now uncertain, because a friend strongly recommends installing a heat pump for underfloor heating. I would appreciate any answers, recommendations, and experiences.
we are planning to build a single-family house with underfloor heating (about 200 m² (2,150 sq ft) for 4 people). The energy standard will comply with the 2016 Energy Saving Ordinance, not a KfW standard. The walls will be made of thermal insulation bricks, 36.5 cm (14.4 inches) thick with a thermal conductivity (lambda) of 0.08, and triple glazing with a U-value of 0.8. The builder’s specifications include a gas condensing boiler (Vaillant ecoTecplus with a seasonal efficiency of 109%), a solar collector system (7.53 m² (81 sq ft)), and a combined storage tank (600/170 liters (158/45 gallons)). The builder recommends this setup. They advise against using a heat pump. However, I am now uncertain, because a friend strongly recommends installing a heat pump for underfloor heating. I would appreciate any answers, recommendations, and experiences.
My acquaintance said that heating costs would be higher than with a heat pump. Additionally, the gas condensing boiler is not particularly suitable for underfloor heating because underfloor heating requires lower flow temperatures. Is it possible to achieve such low flow temperatures with a gas condensing boiler? Or does it always operate with higher flow temperatures?
Bob79 schrieb:
My acquaintance said that the heating costs would be higher than with a heat pump. In addition, the gas condensing boiler is not particularly suitable for underfloor heating because underfloor heating requires lower flow temperatures. Is it possible to achieve such low flow temperatures with a gas condensing boiler? Or does it always operate at higher flow temperatures?That’s simply not true. What does your acquaintance do to make such statements?
Heating costs for an air-source heat pump and gas with collectors are roughly the same, depending on how severe a winter is and how much hot water you need. And yes, you can also operate a gas system at low flow temperatures. Why wouldn’t you?
In your utility room, there will be an insulated tank containing hot water, which is heated either by gas, solar energy, or a combination of both. The size should be sufficient for everyone living in the house to comfortably take showers, for example. Heating more water than necessary is a waste of energy. Karsten
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