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Yes... that is the question. However, I'm not convinced it isn't the heaters as opposed to the flow. I just have a Taco -007 single speed pump and no flow meters so I really don't know the flow rate. Last evening I put an output to input loop with a ball valve and lowered all the temps such...

Sorry the heater is turning off going into standby mode. The stat and therefore circ pump continue to run. I realize the heater will operate only when it senses flow over .4gpm. So it is operating and flowing then suddenly the heater shuts down. Nothing is frozen and I used glycol 50/50 made for...

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...

I think I figured that the temp difference was to big and the heater sensed that it couldnt keep up and shut down. I was setting it to 120 out and the input was only 60. Now Im goung to try to slowly bring the slab up to temp by setting output temp to 90 until I get some heat into slab. How long...

Thanks... I don't see anything about over temp in manual or auto shut off. The thermostat controls the Taco pump and that never shuts off. The flow just continues. Since I just started up the system, the return temp hasn't risen at all yet... just sits at around 63 degrees. The output temp...

Update on my system-i started this thread and got great advice. All filled and air out, Taco pump, thermostat, exp tank, air eliminator all work great and no leaks. However my heater 9kw rheem elec. tankless only stays on for 15-25 minutes then shuts off. No blinking leds just shuts off. Cycle...

Thanks... I'm almost ready to fire it up.... just need to get that damn water/glycol mixture in there-

One more stupid question: How do I fill the system with water/antifreeze? I don't have running water supply in garage. Thsnks

Thanks all, The garage is well insulated and in Minnesota - so not Siberia but it doews get cold. It won't be a shop but I would like it to keep the cars and other toys warm in the winter and available to work on cars if I need to without completely freezing. It is well insulated but I don't...

Thanks guys. Yes, I have a 50 amp breaker.. not 40 -don't know what I was thinking as I calculated what I needed for the 9kw heater at 46amps too. But, I do have another question... connecting all the components.. can I use the 3/4 pex or does it have to be copper? I have a few bends to go...

Thanks...that is what I needed. However what is on top of the exp tank? A vent or pressure relief? And to the rt of the tank, what is that thing??

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...