Much appreciated, I'm glad you like the videos. As far as your question goes here's what I have to say. If you are installing underfloor pex heating you should really have a separate dedicated hot water heater. This is because underfloor heating operates at a much lower temperature range (114F - 95F) than traditional hydronic heating systems. The heat source for underfloor heating is usually a condensing boiler or a heat pump, which are both well matched to these lower operating temperatures to maximize boiler/heat pump efficiency. Install a separate direct gas-fired, condensing hot water heater if you want hot water at 125F-140F or partially heat an indirect tank with the underfloor heating circuit, topped up with electric immersion heaters (if electricity is cheap) to achieve the required temperature. A separate gas-fired condensing boiler would be best because the water coming back from the underfloor heating will be much cooler than from radiators/baseboards and perfect for a condensing boiler. But if that's not practical, you can add a mixing device. Here's an article on the topic: www.pmengineer.com/articles/87952-creating-multiple-water-temperatures-in-hydronic-heating-systems I would also like to hear the opinions of other plumbers/HVAC technicians.
No. Condensation can occur only if dew point is reach on the floor. If the water inside the system is at room temperature like it should be it's fine. If it's like 5-10 degree cooler in the pipe and it's a rainy day (high humidity in air if you don't dehumidify) you could condense the air humidity (reach the dew point) on the floor. That's why it's more difficult to cool your house with a radian floor.
Good job explaining it. Thank you!
I would like to see how is installed and how the hot water is supply if I need a independent water heater by the way excellent videos.
Much appreciated, I'm glad you like the videos. As far as your question goes here's what I have to say.
If you are installing underfloor pex heating you should really have a separate dedicated hot water heater. This is because underfloor heating operates at a much lower temperature range (114F - 95F) than traditional hydronic heating systems. The heat source for underfloor heating is usually a condensing boiler or a heat pump, which are both well matched to these lower operating temperatures to maximize boiler/heat pump efficiency.
Install a separate direct gas-fired, condensing hot water heater if you want hot water at 125F-140F or partially heat an indirect tank with the underfloor heating circuit, topped up with electric immersion heaters (if electricity is cheap) to achieve the required temperature.
A separate gas-fired condensing boiler would be best because the water coming back from the underfloor heating will be much cooler than from radiators/baseboards and perfect for a condensing boiler. But if that's not practical, you can add a mixing device. Here's an article on the topic:
www.pmengineer.com/articles/87952-creating-multiple-water-temperatures-in-hydronic-heating-systems
I would also like to hear the opinions of other plumbers/HVAC technicians.
@@PEXUniverse you are spot on here guys.
You would need to add a mixing valve to lower the temperature of the boiler water.
Can these be used on concrete? I’m putting radiant heat onto a slab concrete floor.
Not needed for concrete
How well would this work with a outside wood boiler? Water temp is usually 180 degrees,is this to hot for floor heat
Yes it will
just use a mixing valve to get the water temp
Are there issues with condensation when the systems not on? thanks
No. Condensation can occur only if dew point is reach on the floor. If the water inside the system is at room temperature like it should be it's fine. If it's like 5-10 degree cooler in the pipe and it's a rainy day (high humidity in air if you don't dehumidify) you could condense the air humidity (reach the dew point) on the floor. That's why it's more difficult to cool your house with a radian floor.
very expensive. i think the price on the website is wrong...
I think your 5 years late on the whole price thing, sleepy joe became president like 3 years ago and now everything cost bookoo ever since💰