Mines a outside boiler you can run lines in any direction you need to.

We usually have high humidity here so in my case a wood stove is the only way to go. It will dry wet fur like nothing else, l can go from 90% humidity to 20% in a few hours.

I do a wood stove, burn it alot because its also the lure and bait making shop. I got a fan mounted almost as high as it go, and a blower on the stove . Regulate the heat by opening door, works good and plenty of wood around.

The advantage of the outside boiler is the fire is out of the building and the heat is dry also a fan keeps everything dry.

As is mine but I am limited to distance from the boiler. practical length of lines= $, heat lose per foot, and pump size.
I have a heat master c 375 165' from my house. If I'm going to heat the shed with it I'm going to want it as close to the boiler as I can get it. Less pipe, and work but due to lay out of property most logical. Unless I want to run another 170' of line up to an old out building. It needs a lot of work new metal on roof, new doors, windows and a sliding door boxed off but has electric all ready. I would probably be better off tearing it down and building a new pole barn in its place and heating it with the boiler. But that's getting into more cash than I want to let go of right now( more than I have) .

Not only do you eliminate the fire hazard but also the dirt, bugs,smoke, and having to split and cut you wood small. With 48" deep x 36 fire box with 24x24 door it saves a lot of work. Plus all those piced that are odd and wont split or fit in a normal stove fit no problem.


Edit to add: I forgot unlimited free hot water. 5 people take a shower back to back as long as they want and the one going 5th has as much hot water as the first. Also saves about 300$ on electricity when I shut off the hot water heater for 8-9 months.

If building new consider in floor radiant heat. I built 32’ x 32’ shop with in floor heat. Use a 40 gallon hot water heater and a 3 zone system. Maintain 60 degrees all fall/winter and have hot potable water all year. Use about 100 gallons of propane per year. I do have 24” blown insulation in the ceiling, 5.5 bat walls & 2” under the concrete. Not much wind load as I’m quite sheltered. Once the concrete is warm it is really nice.

I’m really happy with this system. Crazy but I still burn wood for the house; we just like wood heat better and I still have maybe 1000 ash trees to cut yet🙄

Propane.