Aftermarket heater options

[Casaid1]

I'm grafting a 1980s Year-A-Round cab on a 2013 Massey and I'm needing to add a heater for the winter. What have yall used for aftermarket heaters? I've already got the heater core and some random parts to make a normal "radiator coolant" style heater but I'm just wondering if maybe a diesel 12V heater would be better because it'll get hot much faster than waiting for the radiator to heat up when its -20 and I can turn it on via Bluetooth. Or maybe something I'm unaware of?? Thanks everyone

Just because I'm sure you're curious here's pics of the project.

 

[CalG]

From my reading by those that use the fuel burners to heat a camper etc.
The good ones are good, but pricey.
The inexpensive ones are built light, and likely have a rather shorter service life.

The camper crowd likely would not need to use the units all that often, and so get useful results from the Chinese imports.

 

[CalG]

Just a off hand comment.

I ran Audi vehicles for quite a number of years. Particularly the A8s of the 90s.
I noted that there was a peculiar pattern pre punched into the plastic belly pan. On investigation I discovered that the configuration was meant to allow installation of a gasoline (or fuel) fired preheater that was commonly offered for Scandinavian and the Russian market.
I don't recall the manufacturer, but it's one of the market leaders.

Just something of interest...
Myself, I have the heater assembly from an old truck kicking around the shop somewhere, "just in case".
It's less than a qubic foot in size, with water ports, a 12v fan, heat exchanger, and a flapper door to direct the output.

I run open station here in the woods, but... the unit is there if I need it. ;-)