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The firebox is filled with wood and is lit. You don't add wood while the fire is burning. The masonry heater is designed to burn very hot to maximise efficiency and minimise emissions.


The combustion gases are channelled up and down through the heater. The heat they contain is absorbed into the core and the masonry facing before reaching the flue, rather than being wasted as with other wood heaters.


This stored heat is then radiated out for 18 – 24 hours to warm your home. 

How It Works
Our Heater


We sell a kit that is designed for an owner–builder or a tradesperson to build. The kit comes with all that is required (except the flue and facing which you choose and supply) and detailed instructions.

There are various designs:

  • to fit against a wall, or

  • inside a room (often as a divider between a lounge and dining room).


Then either:

  • a glass door on one side or on both sides, and

  • with or without a bake oven.


The core is rectangular in plan. It is 1.2m by 0.8m with the masonry facing. The flue can go at either side or the back, adding 0.5m. It can be displaced up to 1.5m from the heater to provide a heated bench.

Heavenly Heat diagram.png


The masonry surround may be in any solid masonry material; brick or stone; plain or with a rendered finish. It should be 100 - 125mm thick and must be without voids.

A clearance must be left to any combustible materials but the unit can be built against a non-combustible wall such as brick or rammed earth. The flue should be 200mm stainless steel. As for all wood heaters, installations must comply with AS 2918. 



The heater comes as a kit. It is perfect for owner builders who can assemble the kit and then face it with solid masonry – stone, brick or brick with render or tiles.


If you aren’t an owner builder, any good bricklayer or mason can construct it. We are also able to recommend builders to you,


<- Have a look here at one being built.

Brick, 1 door - Heavenly Heat Masonry Heaters.jpg


Any clean wood can be used as fuel as long as it is well dried. Hardwood and softwood can be used. Softwood is not as dense as hardwood so you need a greater volume for the same weight. Softwood burns faster than hardwood.

To maximise efficiency, burn a full firebox, which takes about 20Kg of hardwood.

Use well dried wood. As with all heaters, damp fuel creates pollution and reduces energy gained from the burn. 

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