Both types of heater use the rocket heater combustion system but rather than raditating 2/3rds of the heat into the surrounding space, all of the heat is put into thermal mass. Like all masonry heaters, the heat is absorbed by mass and gradually released into the surrounding space.
While the barrel on a rocket mass heater or cast iron stove frequently exceeds 500°F, the surface of Dragon Heaters Castle Builds & Derrick Build will stay less than 200°F most of the time. This is the temperature that hydrondic radiators utilize.
The amount of heat stored can be adjusted for different climates and firing rates. The rate at which heat is accumulated into the system is dependent on the combustion system size. Depending on the size of your implentation it will take from 1-3 hours for the heat to migrate out to surface. However the heat will continue to migrate for many many hours, unlike a cast iron stove.
These heaters are designed to be fired for 3-4 hours twice a day, rather than all the time like a rocket heater. They have more decorator choices, are faster to build, and have more decorating options.
Right: 6" Dragon Rocket Masonry Heater with an oven and a single bell for heat capture. The large stove pipe facilates radiant heat of any surplus heat not captured by the bell tower. The decorative plaster finish has not been applied. Click here to see an example of this size heater covered in stone.
To insure strong drafting and the most efficient heat capture all the masonry heater designs use bells rather than flues. You can read more about the difference by clicking here...
By using developing unique construction techniques that use common chimney flues to build the heater, masonry heaters can be built quickly by users or a mason, saving on labor and materials.
Left: 4" Rocket Masonry Heater located in a small shop was finished using some high temperature paint. This size heater is perfect for small house heating.