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What does everyone like for t-stats (preferably 802.11x WiFi enabled)? For the sake of simplicity, I'd love to use a line voltage t-stat...but having the ability to control and track runtime is needed. What is a typical return temp when the slab surface is say 65°F? Thanks again, gents...

I just flushed all the Cryo-Tek 100 out of my system today. Had low flow through my tankless...its still not perfect, but straight water made a big difference. Anyone want to buy 10 gallons of Cryo-Tek 100, 60% Walmart spring water mix? :) ...sent via mobile device (Tapatalk).

Awesome info! So far 110°F at the heat source and sending 106°F seems to be working well. The flexibility of being able to change this is nice...I'll likely mess with this more. Small world. I know the area fairly well - I used to work at JD in Waterloo for a short while...lots of guys lived...

There are indeed a lot of opinions and facts. It takes a lot of reading to arrive at a solution...and even then, things change or it doesn't perform like you had hoped. I read the warnings about not using anything but a real bone fide boiler, but then I started seeing how many folks are not...

Now that is some great real world info right there...thank you! I've been wondering what I should be seeing for slab surface temps in relation to room ambient. Excellent info! I was working out there this weekend hammering away on some steel and at 56°F (heat wasn't running), I was in short...

System is now filled with 100% water. I did not like the cloudy appearance of the glycol/water mix at the lower concentration, so I filled and purged until the water ran clear and then ran another 15 gallons through. 3.5 GPM with purge tee closed, 2.9 with it open. In: 60°F Out: 110°F...

I purged the heck out of the system using two different locations for feed/return. I also cleaned the screen in the Takagi...again...now I'm seeing 3.5 GPM. Progress! ...sent via mobile device (Tapatalk).

Well...I drained 10 gallons of the glycol/water mix (60% glycol) and added 10 gallons of straight water. With the purge valve closed and both pumps set on high I'm now seeing 2.6 GPM at the Takagi. The added water and reduced glycol concentration provided about 0.3 GPM gain. I don't have a...

My two pump system (in theory) allows for a second future zone that feeds from and flows into the primary loop without the use of motorized zone valves or mixing valves. The 15-58FC'S are $89 and then there's probably $50 total in Webstone flanges with ball valves involved per pump. The purge...

I modeled my system based on a few primary/secondary loop systems...including one that is commercially available as a pre-made panel. I've never seen a primary/secondary loop setup with only one pump... ...sent via mobile device (Tapatalk).

That makes sense. After I cleaned the screens and filled/purged the system, I fired it up. Return temp was about 42...now it's 70...after 6 hours with the purge tee closed and heat source set to 110. Both 15-58FC's are on high...2.0 GPM as indicated by the Takagi. I just measured the surface...

Temp/flow chart ...sent via mobile device (Tapatalk).

Brass strainer ...sent via mobile device (Tapatalk).

Takagi inlet screen ...sent via mobile device (Tapatalk).

Cryo-Tek 100 glycol concentration chart ...sent via mobile device (Tapatalk).

I have 2" of 25 PSI EPS (Owens Corning Foamular 250) under the 4" slab and around the entire perimeter where it meets the frost walls / foundation. 1/2" oxygen barrier PEX is stapled to the EPS. I can definitely reduce the glycol concentration...that's fairly easy to do. I agree that we rarely...

With both circulators set on high, the flow through the tankless is now 2.2 - 2.4 GPM with the purge tee closed. The debris in the tankless inlet screen was not helping matters. There wasn't much in the brass strainer I plumbed in. ...sent via mobile device (Tapatalk).

Good note on the system cleaner. There may be periods of time when I'm gone for upwards of 3 weeks. If the system had a failure, Murphy's Law dictates that it would occur in the dead of a cold snap while I'm away. Power outages are also a possibility out here...and with reduced population...

Here is a thread showing my somewhat complete system. Including the Matsui isolation/drain valves and the Takagi. I still need to extend the 3/4" black iron LP gas feed line, run a dedicated home run for the power (I'm running it off a 25' 14GA extension cord for now) and install a zone...

Excellent info, guys - thank you! I'm seeing some conflicting information. Some are setting the heat source to a lower temp and having good results, while others have it set higher. After I started this thread, I ran the system for several hours with the purge tee closed and the heat source...