anything new on Rocket Stove Boilers?

Yes I know it is dangerous to heat water with a rocket stove. You want to have an open system so if the water starts to steam, it will escape and not build up pressure. I am not sure if connecting a tube to collect the heat with both ends connected to an open storage tank would not still be dangerous because I have seen videos of water going into a dry tube and the steam that can build up.
Yes I can just put a large tank on the top of a rocket stove, build a water heater as part of the rocket oven video, or look up about a bell batch rocket stove (that I am told is harder to use than a normal rocket stove. But I would like to know what currently the experts think is the best way to heat water for radiant heat using a rocket stove/rocket mass heater.
Thanks.

Have you seen Matt Walker's boiler? He built it in 2020.

Thank you. No, I had not heard of Walker stoves before. watched the video. has anyone tried one of his boilers (or stoves?

Eric Rothoff wrote:Thank you. No, I had not heard of Walker stoves before. watched the video. has anyone tried one of his boilers (or stoves?

Thomas Rubino here on the forums has worked closely with Matt and builds doors that work with his designs. I know that Tom built an outdoor oven using Matt's riserless core. There are several other cookstove builds on here under names like "Continental Stove."

Hi Eric;
My Walker stove is his BBQ version.
I call it a Black or White oven.
His water heater is very similar, although it may use a larger core variant than mine.
A water tank is contained inside the bell, where it is safely heated.

Matt's riserless core is a proven design with many variations.
They are slow to start when constructed with heavy firebricks; the Ceramic board versions light quickly and burn cleanly.
The heavy brick holds heat longer.
Both burn clean when hot.