A tubular grate heater is any grate or heat exchanger for a fireplace designed from metal tubing. Through the tubing is circulated home air, that becomes heated by the fire. The air is then vented back into the room and home. It is a heat recovery device that improves the efficiency and ability of a fireplace to get the heat from the fire out and into the home. From simple to ornate they can contribute significantly to the overall comfort of a room and potentially to a whole house. This in turn will reduce the amount of firewood needed to achieve the same comfort level, potentially reducing heating costs and expenses.
Tubular grate heaters increase the efficiency of a fireplace and hence the amount of heat that makes it from the fireplace out into the home. They work by having naturally convected and forced air funneled into the metal heat exchanger tubing that is then heated by the coals and/or fire. They draw in cold air from the floor and blow heated air back out into your home. This adds an element of conductive and convective heating to the radiant heat typical of a basic fireplace. Grate Heaters have been called many things; heatilator, hearth heater, fireplace blower, fireplace grate heater, Fireplace Furnace, tubular grate heater, etc...
The ideal tubular grate heater, would be built like an ideal heat exchanger with as large a surface area as possible with material suitable to minimize the heaters thermal deterioration yet provide good thermal conductivity with a high air flow rate; similar to your home heating Furnace. However the unique environment of a fireplace, and the burning of gas, wood, coal, pellets, etc. requires specific heater designs and material construction making few, if any, Grate Heater compatible to all purpose fuel burning.
The most critical elements of any tubular Grate Heater are: 1) Safety - construction material and method, design and features. 2) Material - quality steel that enhances: thermal conductivity is safe (e.g. Galvanized steel sweats lead) and resist thermal deterioration (e.g. tin, Sheet metal offer little resistance against thermal deterioration). 3) BTU Rating - the combination of the units fire burning efficiency and the systems ability to deliver high volume, high temperature forced air heating into your home.