What is a rocket mass heater?

Why HN readers recommended it

Linked as the quickest way to grasp the rocket mass heater concept in threads on heating and thermal storage.

This is a summary from the source dataset, not an endorsement by Hacker News or the video creator.

Video & recommendation details

Creator / channel

paul wheaton

Topic

rocket mass heaters

Format

explainer

Level

general

HN recommenders in dataset

2

HN mentions in dataset

6

Recommendation years in dataset

2018–2022

These counts and years describe the included Hacker News records; they are not YouTube views or the video’s publication date.

From the original HN conversations

Excerpts from the recorded comments. Follow each source for the full comment and surrounding discussion.

• I wonder what the efficiency is compared to a modern "rocket stove" build [1] Mass rocket stoves are _incredibly_ efficient. So much so that I've always wondered why more similar designs weren't used in times when the primary heat sources were wood, etc. 1 - …

• Best fireplace in terms of efficiency is a rocket mass heater. It burns the wood gas in a secondary burn chamber and then routes the exhaust through a lot of thermal mass. One 2 hour fire a day will usually heat 2000 sq feet of …

• You can do a hybrid approach with the hot metal burn chamber for wood gas and earthen materials to slowly radiate the heat. This is called a rocket mass heater. The exhaust temperature is usually below 100C and often smokeless (a complete burn). Using a …