I have a few of the things you describe already. The universal one I have in the garage is a heating element gleaned from a coffee maker plumbed in series with a positive displacement pump from a big green clean machine. The thing is self priming, uses the coffee maker thermostat, and doesn't even have a switch. Truly simple plug and play Operation.
For indoor use, the snap disk (klixon) thermostats can be found in just about any temperature range you might want. The coffee maker heaters are pretty darn durable and are connected to the rest of the coffee maker with high temperature rubber hose. To select the proper heater for your application, just look at the nameplate on the back of the coffee maker. The wattage rating is the heater power. To avoid having to prime the thing, go for a positive displacement pump. If you're picky about noise, some creative sound isolation might be needed.
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