I need advice with my first rmh

Hi, RMH experts!!
I"m testing now my first rmh with riser 150mm 1m high and barrel 200l.
At first glance everything works well :
Draft is excellent, no backsmoke from the loadingshamber.
At this moment barreloutlet is connected to the chimney with the
Pipe 150mm 3,5m long (without mass, just hanging in the air, for testing).
So, result of the test: barrel top t outside =340 (C)
Barrеl outlet (inside) 170 C
Chimney inlet inside = 120C. I have not the pirometer, using the  contact termometer
with highlimit 400 grad.

Is this normal??
I am worried that if i double the pipe and wrap it up in the mass so chinney
inlet temp will be not more 20-25 grad. Or?
What do you think about?
Houp for understending my englich, i am belarus

Hey, Vladimir. I'm not an expert, so I'm going to try and help you get a good answer from someone who is! Your English is understandable; however, you may want to clarify what it is that you want to do and what your concern is. Here's your measurements in American units:

6 inch system, 3ft tall riser, 55 gal drum, and 6 ft of pipe before the chimney.

Barrel top 650°F, barrel outlet 340°F, chimney inlet 250°F

20-25°C = 68-77°F, which is not realistic temperatures to have even at the very end of the system's exhaust. Is that what you meant?

Hi Vlad;    Welcome to Permies!
And Congratulation's on building your RMH!

The numbers and temperatures you are getting are right where they should be for a new build.

Currently with no mass .
You are shedding heat from your pipes until you  create a heat holding mass  over top of them.
Once you add your extra pipe run and cover it over, your stove will burn even better.
No worries that your outlet temp will be low.

Good Job !   We would like to see pictures.

thomas rubino wrote:Hi Vlad;    Welcome to Permies!
And Congratulation's on building your RMH!

The numbers and temperatures you are getting are right where they should be for a new build.

Currently with no mass .
You are shedding heat from your pipes until you  create a heat holding mass  over top of them.
Once you add your extra pipe run and cover it over, your stove will burn even better.
No worries that your outlet temp will be low.

Good Job !   We would like to see pictures.

thanks for the answer! I will continue to work -  insulate part of the barrel with adobe and build a bench.
if everything works out, I will present a photo of the finished rmh lto your judgment.
Thank you

Hey Vladimir!

I think if you want to extract and store heat from your system, mass is what you need. Not necessarily adobe “insulation“.

Using rocks or clay based bricks, on and around part your barrel, for thermal storage might be a good idea.

Also, I would suggest sending some detail photos of your build as you are doing it. The experienced builders here can help give you guidance and advice through the process as you are building. That can really be helpful when you are first learning to build. They help me a lot.

Have fun and good luck!

Cheers, Peter✌🏽

P.S. rocks on top of barrel are a quick way to get some mass as well.