I just installed a happybuy chines Espar clone. I will be doing a write up on the install and function of the heater very soon. I believe the chines diesel air heaters are a very close copy if not an exact copy of the Espar/airtronics units. (no instructions included) quality to be determined.
These diesel injected units do not cycle on and off like traditional heaters.
Even with thermostat control, the unit will ramp up to full speed and full heat output until the desired temp is met, then it will drop the fuel injection rate and fan speed down to the lowest setting but will never shut off until turned off manually or by the timer. If the unit cycled on and off it would build up soot very quickly plus waist a lot of fuel. the worm up cycle for the glow plug draws 7- 9amp every time it has to cold start. The digital controller/thermostats are pretty cool, you can set max/min pump output and also fan speed.
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2007 E350 RB50 Sportsmoble, Always longwinded and misspelled.
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