Used, no warranty, no returns
Used Hot Products Water Heater Jr Kart Pro with Inline Check Valve and connection hoses
See Photos of Temp Gauge while unit was in operation.  You may or may  not see the on lamp in the photos.  
Currently the system is primed and ready for use.  If you are storing in cold temperatures, you must drain and follow the purge instructions found on the unit.  

Owners manual available through MFG

Below description taken from MFG website 
The Hot Head Jr Kart Pro Engine Heaters is based on the Jr PRO (Learn more) unit but incorporates a precision, user adjustable thermostat.  This is essential for limiting the temperature of a 2 cycle engines as they make maximum power at around 130F (155C) max.  Simply set the adjustment (knob) to the desired temperature and go about more race winning preparations.  The unit's accessory list includes Integrating hardware for outfitting most any 2 cycle engine.  This unit has sufficient power (1500w) to heat multiple karts, one at at time or two at once using our KartLink accessory.  

Quality, Oetiker/JiffyTite quick connect fittings

Heat, cooling modes with user adjustable thermostat

Robust and debris tolerant pump featuring seal-less magnetic drive, ceramic bearing, computer protection

Measuring only 16" x 11" x 9" and weighs less than 20lbs (8.5kg.)