Hello everyone,
Over the past few days, I have been researching the topic of heating systems and sizing, and I keep encountering different approaches. I would like to hear from those who have installed a gas condensing boiler with underfloor heating in their new build about how their system was sized.
The following points are of interest to me:
Supply temperature:
Spacing of the piping:
Individually or more closely spaced pipes in bathrooms and near windows (Yes / No):
Maximum length of heating circuits:
Material of the pipes (PEX / aluminum composite):
For how many square meters was one heating circuit designed? Ideally, the room size in square meters and the number of heating circuits.
A brief practical feedback:
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Currently, I have received offers assuming supply temperatures of 45°C (113°F), pipe spacing of 15cm (6 inches), no individual adjustments in bathrooms and window areas, and the use of aluminum composite pipes. The heating circuits are supposed to be a maximum of 80 meters (262 feet) long. This seems rather suboptimal compared to my online research.
With a sufficient number of responses, at least a trend might become apparent.
Thank you in advance.
Over the past few days, I have been researching the topic of heating systems and sizing, and I keep encountering different approaches. I would like to hear from those who have installed a gas condensing boiler with underfloor heating in their new build about how their system was sized.
The following points are of interest to me:
Supply temperature:
Spacing of the piping:
Individually or more closely spaced pipes in bathrooms and near windows (Yes / No):
Maximum length of heating circuits:
Material of the pipes (PEX / aluminum composite):
For how many square meters was one heating circuit designed? Ideally, the room size in square meters and the number of heating circuits.
A brief practical feedback:
----------------------------------------------------------------------------
Currently, I have received offers assuming supply temperatures of 45°C (113°F), pipe spacing of 15cm (6 inches), no individual adjustments in bathrooms and window areas, and the use of aluminum composite pipes. The heating circuits are supposed to be a maximum of 80 meters (262 feet) long. This seems rather suboptimal compared to my online research.
With a sufficient number of responses, at least a trend might become apparent.
Thank you in advance.
EveundGerd29 Dec 2015 22:58I will get back to you tomorrow. I need to retrieve the data from the folder, as I don’t have it memorized.
S
Sebastian7930 Dec 2015 07:49Have a heating load calculation done with an installation recommendation for the underfloor heating – that way, everything will be accurately specified.
There are also factors that cannot be determined arbitrarily: the maximum length per heating circuit is 100 m (330 feet) – and even with very tight installation radii in the bathroom, the area alone will not be sufficient to reach the typically desired 23-24°C (73-75°F) if all other rooms are designed for significantly lower temperatures.
I also find a 45°C (113°F) supply temperature quite high – why not design for 35°C (95°F)?
There are also factors that cannot be determined arbitrarily: the maximum length per heating circuit is 100 m (330 feet) – and even with very tight installation radii in the bathroom, the area alone will not be sufficient to reach the typically desired 23-24°C (73-75°F) if all other rooms are designed for significantly lower temperatures.
I also find a 45°C (113°F) supply temperature quite high – why not design for 35°C (95°F)?
S
Sebastian7930 Dec 2015 08:20Engineering firms – or simply try searching online, there are several providers. It cost me around 200 euros.
I have a roof pitch of 35 degrees... 15cm (6 inches) everywhere on the floor-to-ceiling windows, 5cm (2 inches) maximum. The length is just under 100m (330 feet) and was usually sufficient for about 15sqm (160 sq ft)... Practical feedback: it works quite well without thermal break. The 24°C (75°F) in the bathroom is no problem, elsewhere it’s between 21-23°C (70-73°F).