quality German made Eberspacher D5W hydronic heater
12VDC
this heats and circulates hot water for winter heating in trucks boats RVs tiny homes

Unit failed to light.
Bought the code reading device $250 to learn the circulation pump has failed.
Complete system including the code reader $450
w/thermostat
D5W unit itself
wiring
fuel line kit
etc
all of it.
Yah, expensive and still needs a pump..
German made is better than China made...