RMH vs gasifier boiler

Hi,
I heat with hot water or a open end geothermal system. I live on 10 acres of wooded land and have to clean up a lot of trees. I have read and watched about RMH. ( all 8 DVD's)  but as I use a boiler, i don't want to use a closed Rocket stove heat system (Boom squish) and I have not seen much on open water heating system. a Batch RMH was look promising because I have and would use regular log sizes instead of constant feeding of a J tube RMH. with smaller wood sizes.   Also, I would build it in a small shed rather than inside the house because of the increase in insurance costs.  so I am wondering how the newer gasifier wood boilers compare to anything I can build. Does anyone have any experience or knowledge?

I was not sure exactly what an open end geothermal system is but, a quick AI result shows this ….

Geothermal technologies -
An open-loop geothermal system, sometimes called a "pump-and-dump" system, uses an open-ended pipe to draw groundwater or surface water from a well, pond, or aquifer, circulates it through an indoor heat pump for heating or cooling, and then discharges it back into the ground, a pond, or a drainage ditch. These systems are highly efficient and have lower upfront costs than closed-loop systems but require a plentiful and clean water source, proper water discharge, and can have higher maintenance requirements due to water quality issues.

So I think we would still need more info about how your present system works and how your  present gasifier  works, how much fuel it uses and how often it is burning?

I have the open-loop Geo thermal system, and yes that is exactly what it is. Unfortunately, in the winter months, it has to run constantly because of both how slow it heats, and how cold Michigan winters is. The house was built with hot water radiator heat, with currently I use LP on those cold months. I use to use a wood boiler but that broke down, and I put in the open-loop for more the air conditioning  than heating. I pulled the wood boiler, but was thinking to put another wood heat source for backup heat. This time I am thinking of outside to keep down on the dust, and lower the insurance by $150 a year. RMH don't look to be a good fit with the constant wood feeding of the J tubes, and the fact that RHM generally heat gravel or cob rather than water.  I know the gasifier boilers are more efficient that the normal wood boilers, (which uses 10x more wood than an RHM) and a lot more efficient that the outside wood boiliers. so I am asking what people think would be a good option for secondary wood heat.

Not my money, but if I were in that situation I’d probably do the gasifier boiler mounted in a small metal building. One end would be a small boiler room with rock wool insulation (fire and rodent resistant) and a bigger wood shed area on the other end. Big door in between that will fit a pallet jack so you can roll a tote of wood in at a time.  

Definitely NOT an outdoor boiler, you are 1000% right on that choice.

A rmh is more efficient for a simple space, but retrofitting into a house not designed for wood heat can be suboptimal.

Ok well the videos you have watched are not really up to date with the latest designs  so I will give you a quick and basic run through without hopefully, repeating what you already know.
So as a rule of thumb a RMH is situated in the room where the heat is most wanted and not remotely.
The actual stove itself is part of the heat storage and more often placed inside the actual mass.
Although some folk (namely Thomas) will continuously burn their stoves, as a more general rule RMH are only fired up a couple of times a day to maintain the heat stored in the mass.
Most of the modern designs are designed to run flat out like a raging fire  and not an air restricted, long, slow burn.
A fully loaded stove can run for an hour or so with lots of visible flame and then another hour ish on coals.
Heating water with a RMH is a topical subject that some folk claim to have mastered but the vast majority of of threads on the subject dont really offer a conclusive or satisfactory solution.
In your case, it may be possible to pump water through an enclosure placed remotely but I dont think the situation will be ideal!
In conclusion, when a modern design batch box, is placed in a central position, inside a building using the ‘Bell’ concept, then they are very efficient at doing the job they have been designed to do.
Outside of that concept, nothing is so well tried and tested.
No to say your idea cant be done, just that you may be pioneering a lot of new ideas…..

If you can get insurance with a RMH in the house at $150 extra per year, the extreme efficiency, simplicity of build, plus ease of use may well outweigh the added cost. How is your house laid out? Is a central mass heat source going to work in it? An open water heating method that avoids boom-squish and connects to your existing circulation may be a worthwhile enhancement. If planned for from the start, it could be added at any time.