By the time you're done fiddling with the Chinese heater and making it safe for marine use you could have bought a quality unit BTDT.
* A Marine specific unit has different fuel line, not plastic. Plastic fuel linesdo not meet ABYC, USCG or minimum standards your insurance company may want to see depending upon where you are..
*Marine units have marine specific software to minimize lock outs. On trucks they know where the fuel tanks are in comparison to the fuel metering pump. Not so on boats so the software is different.
*The truck kits (Chinese) comes with very little duct hose & less supply/return outlets/inlets
*The truck kits do not come with exhaust lagging.
*The Chinesetruck kit does not come with double walled marine SS exhaust hose it is single wall and not recommended as safe for marine use.
*The Chinese truck kit does not come with the exhaust fitting for the transom
*The Chinese truck kit does not come with a marine mounting bracket, they mount them on a floor. Floor mount is steel not SS.
*Marine units such as Espar & Webasto or Wallas use a larger duct hose diameters and heater outlets to make up for the longer runs in boats.
*Chinese units kits don't come with exhaust condensate drains
I would urge you to buy the unit from whomever will stand behind it and service it locally. I would also not install an Espar without the digimax thermostat. These stats allow you to re-set codes and trouble shoot the codes. The service tool for this cost over $1000.00 and the Digi-Max D-1000 stat costs under $100.00
I would also not advise a tee into an existing fuel line. The fuel metering pumps need the small diameter pick up the Espar ships with, or a custom one with small ID, or they tend to lock out and cause problems especially on boats that heel and the pick up may expose.
In short our experience with Chinese diesel heaters was abysmal...
