George Van Beynen
Jorge, 20 years ago I installed a wall mounted propane boiler in my workshop and a propane boiler and hot water maker in the house. Both systems work very well. It is important to size the pump properly to get an adequate temperature drop on all loops. I also switched from a wall mounted thermostat to a slab temperature sensor, it seems to control the temperature more evenly.
In 2008 I installed a Garn high efficiency wood boiler. It heats the workshop and house and heats the domestic hot water 12 months a year. I still have the propane boilers for backup when I am gone for an extended period of time.