Since my maximum installation height is unfortunately very limited (max. 50mm (2 inches)), I have to use a thin-layer screed system. Schlüter offers a suitable system with Bekotec. It provides the option to choose an installation spacing of either 75mm (3 inches) or 150mm (6 inches).
What pipe length per m² can be expected with these spacings? Unfortunately, I only find information online for 100mm (4 inches) or more: for 150mm (6 inches) spacing, it would be around 5.8m/m² (Schlüter’s own calculator indicates approximately 6.7m/m² -> which one is correct?). How much pipe length per square meter would it be with a spacing of 75mm (3 inches)?
For example, with my roughly 35m² (375 ft²) living room, this would already result in 6 separate heating circuits if I want to keep each circuit under 100m (330 ft).
How should I decide which spacing to choose, and would 15cm (6 inches) spacing be sufficient?
What pipe length per m² can be expected with these spacings? Unfortunately, I only find information online for 100mm (4 inches) or more: for 150mm (6 inches) spacing, it would be around 5.8m/m² (Schlüter’s own calculator indicates approximately 6.7m/m² -> which one is correct?). How much pipe length per square meter would it be with a spacing of 75mm (3 inches)?
For example, with my roughly 35m² (375 ft²) living room, this would already result in 6 separate heating circuits if I want to keep each circuit under 100m (330 ft).
How should I decide which spacing to choose, and would 15cm (6 inches) spacing be sufficient?
J
jens.knoedel20 Dec 2023 11:15LostWolf schrieb:
150mm would be 5.8m/m² (meters per square meter) hereThat's how it is calculated. So for 75mm, double the amount.LostWolf schrieb:
How do I choose whether 15cm (6 inches) underfloor heating pipes would be sufficient?You actually don’t choose that yourself. You probably have a planner who calculated the room-by-room heat load and based on the desired room temperature and flow/return temperatures, creates a plan. Otherwise, for non-professionals: the smaller the pipe spacing, the better, since this allows the heating system to operate at lower temperatures. A spacing of 15cm (6 inches) is no longer considered state-of-the-art...
Thank you for your answer.
I just want to roughly estimate how many heating circuits I need, and the quantity varies a lot between a pipe spacing of 10cm (5 inches) and 7.5cm (3 inches).
The room-by-room heating load calculation has already been done by the energy consultant.
Some heating installers include underfloor heating with very different systems.
I am currently considering whether I should leave the design to an office and then install the heating pipes myself.
The room temperature is set to 20°C (68°F). The heating load per room was determined based on this.
The supply temperature should be kept as low as possible.
What I don’t understand as a layperson is how the pipe spacing is decided.
But I understand correctly that roughly 100 meters (330 feet) is considered the maximum length for one heating circuit, right?
With a pipe spacing of 7.5cm (3 inches), that would mean only about 7.5m² (80 ft²) per heating circuit.
jens.knoedel schrieb:
You don’t choose that yourself. You probably have a planner who calculated the heating load for each room and based on the desired room temperature and supply/return temperatures, creates a design, right?
I just want to roughly estimate how many heating circuits I need, and the quantity varies a lot between a pipe spacing of 10cm (5 inches) and 7.5cm (3 inches).
The room-by-room heating load calculation has already been done by the energy consultant.
Some heating installers include underfloor heating with very different systems.
I am currently considering whether I should leave the design to an office and then install the heating pipes myself.
The room temperature is set to 20°C (68°F). The heating load per room was determined based on this.
The supply temperature should be kept as low as possible.
What I don’t understand as a layperson is how the pipe spacing is decided.
But I understand correctly that roughly 100 meters (330 feet) is considered the maximum length for one heating circuit, right?
With a pipe spacing of 7.5cm (3 inches), that would mean only about 7.5m² (80 ft²) per heating circuit.
J
jens.knoedel20 Dec 2023 11:39LostWolf schrieb:
I’m currently considering whether I should leave the planning to a professional office and install the heating pipes myself. For example, Ing. Heckmann.
LostWolf schrieb:
The room temperature is set to 20°C (68°F). That’s quite cool.
LostWolf schrieb:
What I don’t understand as a layperson is how the pipe spacing is actually determined. As I said, it is calculated based on the values I mentioned. Given the heating demand and room temperature, the supply and return temperatures are relevant. If you plan with a maximum supply temperature of 45°C (113°F) due to an existing gas heating system, a spacing of 15cm (6 inches) is sufficient. If you are planning a new build with a maximum supply temperature of 30°C (86°F), the spacing can be reduced to 5-10cm (2-4 inches).
That’s why I would always have the heating system professionally planned. Ideally, you will even get a pipe layout plan showing which circuits are installed where and how.
LostWolf schrieb:
But I understand correctly that about 100m (330 ft) is considered the maximum length for a heating circuit, right? Yes.
Example from one of my rooms: 5cm (2 inches) pipe spacing for 20 sqm (215 sq ft) results in about 300m (985 ft) of piping over three circuits. Along with the layout plan including hydraulic data. The target room temperature is 22°C (72°F). Supply/return temperatures are 30/26°C (86/79°F) as maximum values.
I definitely have it calculated.
Shouldn't 5cm (2 inches) spacing require about 20m (66 ft) of pipe per square meter, so for your 20m² (215 sq ft) it would be closer to 400m (1,312 ft)?
Why are there areas in the middle that aren’t spaced as closely?
May I ask how many heating circuits you came up with approximately per floor?
(I now need to roughly determine the location of the manifolds and have to make sure there is enough space there.)
jens.knoedel schrieb:
Example of one room in my case. 5cm (2 inches) pipe spacing over 20m² (215 sq ft) ==> 300m (984 ft) of pipe with three circuits.
Shouldn't 5cm (2 inches) spacing require about 20m (66 ft) of pipe per square meter, so for your 20m² (215 sq ft) it would be closer to 400m (1,312 ft)?
Why are there areas in the middle that aren’t spaced as closely?
May I ask how many heating circuits you came up with approximately per floor?
(I now need to roughly determine the location of the manifolds and have to make sure there is enough space there.)
J
jens.knoedel20 Dec 2023 12:01All values are always approximate. There isn’t that much pressure on the walls or in the center of the circles. The possible bending radii (with my 16mm (5/8 inch) pipes) determine the center for me. It’s simply not possible to install more piping there. This can also be seen clearly in the installation plan.
Besides the room shown, I have another 100m² (1,076 ft²) on one floor. For that, there is a manifold and 12 circuits (about 1,200m (3,937 ft) of piping – heating circuits ranging from 35 to 150m (115 to 492 ft) – most are within the usual range. It just needs to be calculated properly.)
Besides the room shown, I have another 100m² (1,076 ft²) on one floor. For that, there is a manifold and 12 circuits (about 1,200m (3,937 ft) of piping – heating circuits ranging from 35 to 150m (115 to 492 ft) – most are within the usual range. It just needs to be calculated properly.)
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