No, I do not own a portable spa but I saw nowhere to post for an ingound one. Mine is more like a small pool and holds about 500 gal water.
I have had this for over 25 years and replaced the original gas heater twice.
There is no way I can get it to heat between 99 and 106.
I just barely move the temperture dial but it just always says 99 or 106. Never under nor never above.
I would like some suggestions.
The Spa tech has been telling me about the much smaller in size electric heaters but $1800 is just too much to handle on SSA. I need to keep this one running at a comfortable in-between temperature.