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Thanks again, both... Portable tankless have sensors that are supposed to modify the burner on / off when flow rates drop, to maintain steady set point temperature despite flow, typically within 1.5 to 4.0 gpm, depending on size. Low flow will quickly overheat if the down stream sensor has...

Thank you JoyfullNoise, You are correct that I was hoping to modify a single pass tankless to avoid the cost of a "boiler" design. the BTU load I'm wanting however pushes me into $700.00 category for a tankless, plus the add-ons to make it work. A $1000.00 re-circulation / boiler system is...

Hi, if you read my original posting again you'll notice that is exactly what I'm trying to accomplish. :)

I'm visiting the site to inquire of other's input on a hot tub heating conversion approach. See signature or profile for other details. Working on converting a 425 gallon CalSpa hottub 84x84x48 from electric heat (5.5 kW) to tankless water heater natural gas fired on recirculating closed loop...

Very nice forum and community effort. (y) Looking for advise on tankless heating hacks to convert a hottub heating system. Experience in industrial controls and mechanical engineering. Mike = Mikestub