AFAIK, all of the off the shelf models run on electric, whereas most custom jobs use a pool type heater that runs on NG or Propane. Custom is really the way to go if you can do it, because you can keep the water temp relatively low when not in use and then crank it up 30 mins prior to use and it'll be good to go. Less wasted energy and easier on equipment, but obviously a lot more $ then a fully enclosed unit. The all in one jobs use a very small electric heater and stay up to temp all the time. My knowledge is limited though, and there may be much more newer tech out there today than I'm familiar with...good luck, you will enjoy either way!
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1957 Speedster, 1965 356SC, 1965 356SC Outlaw, 1972 911T, 1998 993 C2S, 2018 Targa 4 GTS, 2014 Cayenne S, 2016 Boxster Spyder, 2025 Ranger Raptor
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