You can controll the heat by fitting the heat x in the heater hose lines, after the dash control slide switch. Slide to hot, hot water will come out, over to warm, and the same thing. A 12 volt pump is also needed to push the clean water thru the heat x from the source (river, bucket,etc) Around 8 or 9 litres a minute is good.
When I actually hook mine up properly, I'll take more pics.

Excuses are for losers.