Additional information if some of you may be interested.
Absorption cycle refrigeration and air have been around a very long time. Yes the company I was with serviced them. personally I knew very little about them except they needed simple gas burner service to keep the running. The larger units worked as a "Chiller" and cooled a brine (around 38*) that was piped to the cooling coil on top of a furnace or blower unit.
Absorption refrigerator - Wikipedia, the free encyclopedia
Labeled photo of a domestic absorption refrigerator.
1. Hydrogen enters the pipe with liquid ammonia
2. Ammonia+hydrogen enter the inner compartment of the refrigerator. Change in partial pressure causes ammonia to evaporate. Energy is being drawn from the surroundings - this causes the cooling effect Ammonia+hydrogen return from the inner part, ammonia returns back to absorber and dissolves in water. Hydrogen is free to rise upwards
3. Ammonia gas condensation (passive cooling)
4. Hot ammonia (gas)
5. Heat insulation and separation of water from ammonia gas
6. Heat source (electric)
7. Absorber vessel (water + ammonia solution
Back in the late 50s early 60s there were quite a few gas ac systems in residences and even full size refrigerators being sold and installed, mostly by utility companies.
On boat, in addiction to the dangers of gas and venting, the thing may rust out quick because of steel piping.
A flame is not really necessary to heat the system as I believe the temp needed to start the cycle working is around 240* (why the flame is so small)
Anyways... thought ya'll might like to do some "additional" reading