Gasifying draft (TLUD or other) compared to rocket's draft?

My question is about the plans I have to use a TLUD for heating in the way a RMH does.
A TLUD is a form of gasifier, with an up-draft.
But how much draft?

3 things are better (or at least good options) than a RMH:
- char production
- batch load
- smaller fules

I want to have the TLUD at the 1st floor, and the bench at the 2nd floor.
(My 1st floor is opened, no issue with cleaning.)
But how long can be the heating pipe with the draft of a TLUD?
Other gasifiying device would be better than the TLUD form?
More over, I wanted to heat an oven before sending the hot gases into the heating....

(I have understood that this forum is not only about gas from digestion, but ALL ways to make gas from biomass!)

Thanks

I have nothing to add here except for my interest in addition. I would be interested in using TLUD for cooking and perhaps small room heating and a RMH for the house as a whole.