How to Build a Rocket Mass Heater For a Greenhouse?

Renewable energy is famous for lean practices throughout the globe with a reminder of welfare to our future generations.

One such super-efficient representation of the renewable energy source is a rocket mass heater that runs through the woods. Thus, there are no limitations of trees in our world, and even if they ever runoff, one can plant them again!

So, RMH fueled by the woods is renewable, which also doesn’t require as much lumber as traditional wood-burning heaters do.

And, today’s topic is all about establishing this renewable energy source or the rocket mass heater, especially for your greenhouse.

Let us march towards the topic directly!

What is a rocket mass heater for the greenhouse?

If you have ever thought quite more profound about the heating system in your greenhouse, then you might have already come across various contradictions. The contradictions are related to the existing traditional methods of heating the greenhouse.

And above all of these, you need to be a manager of the greenhouse to start the conversations in the first place. That is to say; if you are being a gardener and ever tried to cultivate all your desired plants throughout all seasons, then you must be familiar with the greenhouse.

Being familiar with the greenhouse also drags various components like a heater to be ubiquitous stuff under consideration. The heater’s task is to make the greenhouse eligible for your plants during shivering cold atmospheres. As a result, plants that don’t grow during the winter can also be developed through a greenhouse.

So, the greenhouse was never a magical term whose naming made it legitimate for every plant at any time of the year. Indeed, the magic of the greenhouse is due to its several factors like capturing the sunlight via glasses, insulating the internal weather, creating artificial surroundings, etc.

With the being said, if you have been that indoor gardener, then you are familiar with those types of greenhouse heaters. Among them, the most familiar and widely used heater is the propane-fueled heater. This type of gas heater is known to cost a fortune. Especially during that nighttime when there remains no sunlight to be captured as the source of heat.

So, there comes an excellent limitation for using this propane as the source of your greenhouse heater. Again, as we know, the greenhouse is a good capture of sunlight, but it is so bad for conserving the heat inside.

As a result, when during cloudy days or at the night time the sunlight is not there, heat conservation also comes to a standstill. This emerges the need for electrical heaters as well. Electrical heaters are not only more expensive than propane-fueled heaters but also so energy-consuming.

As here, electrical energy turns into heat energy and resulting in so many system losses. You end up paying a kong list of electric bills.

Also, there comes a heater that runs by burning woods as fuel. This also leads to several contradictions like a continuous supply of the woods to keep the greenhouse heated for the whole night. Because such won’t of heater consumes a massive ton of wood supplies.

Finally, to balance out all the types of heater and yield a better output which is more long-lasting and economical, the invention of RMH is leaded.

RMH means rocket mass heater, which brings no contradiction like the propane gas for refueling again and again and bearing extra costs. Also, you don’t need electrical energy or a house full of woods.

With a small amount of heat energy as the fuel and supplying very little Woods, one can incorporate a well-established heater for the greenhouse through RMH.

Rocket mass heater consumes eight timeless energy and provides a way higher endurance. It needs a lesser fuel supply for the same amount of heat energy.

Again, RMH runs with higher combustion energy that results in maximum and long-lasting heat production.

How to build a rocket mass heater for a greenhouse?

With all the being said, you have already got enough idea about the rocket mass heater for your greenhouse. No doubt for considering it as the all-rounder winner, but you need to be ready to pay a specific price.

And, that price is nothing but that trouble you need to take while setting it up or building the RMH for your greenhouse. Although there are many readymade kits of the RMH, the central facility when you make it for your own is the ability to customize it according to your need and space.

Because all RMH is not suitable for your type of greenhouse as the heating capacity is entirely dependent on your individual needs. That includes the total spacing of the working place, the power needed per hour, and so on.

For all these things together, the ultimate solution is to build the whole project on your own only though following these below guides:

The necessary supplies

The ingredients for your RMH won’t come through magic or from the air if the required supplies are not ensured. The collections together include all the materials necessary to build the RMH and the tools to assist them.

Ensure all the tools around you such as a marker and tape measure, plumb bob, pliers, tin snips, hammer, welding equipment, drill, saw, and clamp. Avail all of them from the beginning so that no obstacle takes while you start building the RMH.

The required materials which all you need to build complete RMH projects are many. That includes- sheet metal of 26 gauge, sheet metal of 16 gauge, 20 ft. total square tubing of 1” and 6” pipe of the suitable casing, ¼” thick elbow perlite, and stove pipe.

It further includes- ½” metal screw sheets, fire bricks, or high heated cement in case of mortar, sands, regular bricks, silicon, and pain of high temperate.

Required base

The base is the total foundation of the rocket mass heater on which the system relies. Use the 26 gauge sheet metal to prepare the ground according to your need.

Customize the size of the sheet similar to the area in which you want to establish the system. Cut the additional sheet with the tin snips and also use the plumb bob whenever needed. Put the sands on the base as the thermal mass for capturing the heat.

The frame

Next, you need a frame to fit the metal sheets. For the frame, all you need are the 1” square tubing and the required cutting and welding tools.

Cut the square tubing in 7 ½ ”, 7 1/2” 8 1/2”, 15”, 15”, 16”, 19”, 19”, 28”, 34”, 34”, 36 ½” and weld them into a total of 20 ft. The ultimate frame will be one piece of tubing.

The first layering of metal

The first metal is used as the surrounding for the entire frame. It comes at the topmost portion of the firebox area. Cut the 26 gauge sheet metal into a 16” tall metal with 1” additional bit.

You don’t need to work that much on the rest of the 16” metal except cutting it from the 26 gauge sheet through required tools. all you need to do is to work on that additional 1” part by hammering it and making it adjust on a right angle with rest of the metal portion.

The second layering of metal

For this double layering, cut the metal into 20” wide and 89” long size, and this one is screwed into a tall upright position.

The shape of the second metal is also similar to the first metal for the perfect fitting. Connect all the two layers of the metal through screwing with every inch. Paint the metal layering externally so that it can withstand higher temperatures.

Line up the second layering metal with the hole or stove pipe.

Having ash boxes

Prepare an ash box out of a 16 gauge metal with three pieces of 14”×6” for the sides and bottoms and two pieces of 6”×7” for the fronts. The fronts will be an inch taller than the sides.

Weld all of them together correctly to form the complete ash box. Also, don’t forget to weld a handle in the front of the ash box to carry or drag the box from one place to another.

After having them cooled after welding, paint the box with high temperate color to resist the box from higher temperatures.

Some bricks

Stacking bricks is another critical step in building the RMH system. The brick stacking has mainly two purposes. One is the path of traveling smokes from the firebox up to the riser. Again, down to the elbow of stove pipe to the existence or chimney.

The second most important task of the bricks is to retain the sand. The bricks conserve the sands that are used as a thermal mass to have heat.

Enabling a heat riser

A heat riser can be termed the most crucial aspect of your RMH as it increases the heat to encourage the draft capacity. A heat riser is all about a well-insulated long pipe that tends to increase the speed of rising heat.

Thus, a rocket sound is produced due to a powerful draft from which the rocket mass heater came.

You need a 6” well casing of pipe as the interior pipe of the heat riser that is about ½” thicker and 32” longer in measurements. Place the line and ensure it is at the top of the brick stacking that you have just made.

Mark the portion of the brick where you want your pipe to run through. Cut that substantial portion with a saw using the masonry blade. The cut portion should be ensured to keep enough space for the line to sit on the bricks.

The finishing touch

The last and the original work is to do the previous layering with bricks for giving a finishing look. You may require the cutting of bricks as well to fit them right into your RMH heater.

The bricks are placed in such a way that the top of the firebox is covered pretty well. As a result, no smoke or fumes coming out of the top of this brick box. This is also due to the draft of the heat riser attached to this box that pulls the fire horizontally.

If, by any chance, smoke comes out from the box, push the burning ingredients right into the stove so that the riser is heated up and the draft gets started.

Final Words

Last but not least, a rocket mass heater is known for its high and extended draft and wholly insulated chambers for burning. All these results in better heating capacity, which also comes in the cheapest way possible.