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I've been messing with this closed system for years. It always works (keeps 45deg in mn winter) and it has always had low nearly 0 pressure but it still seems to work. I decided to try to get 15psi. My fill pump seems to only get me to 10psi. But when it heat is on it gets to 22 psi. But when...

I know there are so many posts about radiant slab heating, and reading all of it, gave me enough info to be dangerous. I'm in need of about a 10kw electric boiler(have 50amp 220 available) in MN, about 900 sqf spray foamed insul., 3 loops of 275 ft of 1/2" pex. No idea how to calc flow but have...

My question is whether or not to leave the circ pump running during non heat cycle( therm is satisfied) or to have the pump only circulate fluid when heater is on? 800sqft well insulated-although high ceiling- in MN- 3 loops of about 270 ft only want to maintain around 45 degrees. I may have...

Gentlemen, You helped me a ton running in floor heat using an electric on demand water heater, 3 zones and a circ pump. In heat mode(winter) I use a thermostat that controls the circ pump so that when flow is detected, the heater comes on until the set temp is acheived then the circ pump shuts...

Many of you helped me a ton when I installed my system a month ago however, I now have an issue. - My system is a simple one 800sqft garage in MN well insulated (spray foam walls and blown in ceiling) just want to maintain 45 - 50 degrees in winter. 3 - 1/2 inch pex loops each at 275 ft. 9KW...

Hello - New here but I've read everything on in slab radiant heat. But I have a few hopefully simple questions. Never mind if the system in under/over designed...I have what I have and I just want to get it to work as best as I can given the facts that already exist. It doesn't need to be a...