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.
And is the buffer tank actually filled with potable water or also with heating water? According to the building specification, the solar collectors are used for domestic hot water production and heating support. And could someone please also explain what 600/170 means for the buffer tank?
A combination storage tank integrates the heat storage for both heating support and domestic hot water production in a single larger tank. This allows warm water, typically heated by solar thermal systems, to be stored for later use in both applications. It enables bridging periods without sunshine without additional heating, depending on the heating demand and storage capacity. Overall, this takes up less space than two separate buffer tanks and reduces thermal losses. These tanks are usually insulated on the outside and designed to minimize heat loss. Typically, it is a tank-in-tank system, meaning a nested double tank arrangement. This design combines a buffer tank with a heat exchange plate between them. The smaller inner tank at the top stores potable water for showers, washing, etc., while the significantly larger outer tank holds heating water for space heating.
600 refers to the total volume of water
170 refers to the storage volume
600 refers to the total volume of water
170 refers to the storage volume
In my opinion, you shouldn’t choose heating support and should only use five sqm (54 sq ft) of panels for domestic hot water along with a smaller storage tank. This is much more economical. Compare both options. The sun will then provide heat when you don’t need the heating system, between April and October. However, hot water is always needed, even in July. Karsten
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Stefan8906 Jan 2019 22:05Nordlys schrieb:
In my opinion, you should not choose heating support and only use five square meters (54 square feet) of panels for domestic hot water and a smaller storage tank. The question for me would be: what is the minimum collector size he must install according to the Renewable Energy Heat Act.
No, the question is how many cells would make sense for the amount of hot water needed by the family and that should be stored. It’s really pointless to choose a three-liter engine for a car in Denmark, where the maximum speed is 110 km/h (68 mph).
If one or two square meters of solar collector area are missing according to the energy law, so what? Nobody in practice really cares about that. K.
If one or two square meters of solar collector area are missing according to the energy law, so what? Nobody in practice really cares about that. K.
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Caspar20207 Jan 2019 08:56Nordlys schrieb:
Stuff, for a car in Denmark where 110 is the maximum speed, choosing the three-liter engine.But the Danes like to do that. After all, the car also needs to be able to speed on the German autobahns...
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