I apologize I said that incorrectly. Iāll look up the tankless I had. Itās a regulating valve on the water inlet of the tanklessā¦ mine was a Manual screw adjustment. If the water was to hot than I had to restrict the flow by tightening the screw enabling the heating element to work. Eventually when 92f hit than I would no longer have enough psi for the tankless to work. This was of course due to tightening the screw restricting the flow. I figured the higher end tankless would automatically adjust instead of the manual screw. Eventually it will hit the point I had.
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And another thought. tankless hot water heaters werenāt designed for closed loop flow. Possibly higher end ones but they are meant for homes that recieved water from wells or local suppliers.
This is just a thought. Have a three way valve acuator before the inlet of the tankless. So one outlet runs towards the tanklesss. the second outlet from the acuator runs to the outer inlet of a shell and tube. The shell and tube runs to the CLS. The CLS outlet has a thermocouple. The thermocouple runs a master/slave to the acuactor. the thermocouple runs to the inside inlet of the shell and tube. The inside outlet shell and tube runs to the acuator. This way you keep a circular flow and only have to add heat when needed from the tankless. Seems a bit depth but I think it should work?
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new location, new toys.
next trick is a 1bbl conical fermenter => recovery still
for which I of course require heater.
this time I went looking specifically for a boost heater, one designed to give $)@!**&(&)@!_(*ing hot water for sanitizing dishes.
Iām going to give this one a tryā¦
mainly because I canāt afford a hubbel right now.
Itās on the small side, but so is the 1bbl āstillā.
I havenāt pushed go yet, and Iām open to other suggestions for a ~10kw tankless heater that will hit 180F.
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I guess if you canāt afford hubbel you wonāt be able to hold this either but i know a vendor with closed loop water heater/circulators 12kw for around 2k and can go above 212 (depending on pressure your jacket tolerates)
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Sounds like the right tool.
You keeping their contact to yourself 
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Iāll share it if you think you might buy one.
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Share even if no one will buy. Light this place up and letās get information spreading like a wildfire. Fiat lux
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is there a pump in there somewhere?
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is it in a closed loop system? I cant get my tankless to fire in a closed system.
Yes they would have a filter and pump. This was a rough draft. Do you mind describing your process flow for the tankless?
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I have yet to get mine to fire correctly and how I want, lol
Than one of these three things are happening. 1. not enough PSI pushing into the tankless. 2. didnāt burb the lines while feeding and have air pockets in the loop. 3. circulating hot water into the tankless
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can you suggest a pump? ive got a taco pump that can pump up to 120 psi but when I try to pressurize the system it acts like its going to fire and then stopsā¦
thanks for any help man! im kind of at a lose
To be honest save yourself the trouble and make it easy for yourself. Get a reservoir. We used the same pump. You will be burning and turning pumps especially with heavier density ffkuids such as glycol. You will always be force feeding the tankless hot water heater when itās restricting flow due to temperature. Basically creating backpressure on your pump.
The rough draft P&ID is having an understating of automated instrumentation and process flowing. You have experience with this? If so Iām down to help you figure it out but if not switch to a reservoir. Ill help you with this also 
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Did you see the layout @Photon_noir posted up thread?
Do you have an expansion tank?
Pressure gauge?
PRV?
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expansion tank is the one thing I currently dont have but the plan is to add one today with a much bigger pump and see if that might do the trick. everything else is pretty similar to photon_noir post.
Iām going to try and add a reservoir today and see if that with a few other things and see if I cant get it to work, me not so much but one of my guys is helping us set up our FFE to be ran off my cell phone so Iām sure its possible to re-program the tankless heater but not sure hahaha
How about a little bleach tossed in the water?
