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Alternate Heating Systems Coal-Wood Multi-Fuel Boiler
 The air-cooled Rolla-Grate triangular rotary grate system is the heart of the Alternate Heating Systems Coal-Wood Multi-Fuel Boiler. This remarkable system adjusts to maximize burning efficiency for each fuel and to provide a convenient method of removing expended ash from the boiler's firebox. The triangular grate design is made with a hollow core allowing airflow via convection in order to keep the grate cool. This cooling effect prevents warping of the grate components. Depending upon the model purchased there is a minimum of three grates. The boiler is designed so that each grate can be shaken or rotated individually so that ash can be removed only from areas where expended fuel has built up.
Refractory-lined baffling diverts the exhaust through the boiler in order to reclaim as much heat as possible before the combusted exhaust goes out the chimney. Water tubes located beneath the refractory-lined baffle serve to capture this additional heat.
Standard Equipment On All AHS Multi-Fuel Boilers:
- Rolla-Grate™ Rotary Grate System
Opening can be increased from nearly closed to large opening for burning coal
- Large Loading Door
Full gasket for maximum efficiency
- Smoke Flap
- Water Cooled Baffles
- Forced Draft Fan
- Large Removalbe Ash Pan Dual Draft System
Through-the-door draft system for burning wood. Below-gratedraft system for burning coal.
- Automatic Draft Control. Coal Burning Units Avalilable as Single Unit or in 2 Parts. For convenience in handling and installation
- Firebrick Lined Firebox
- Full Width Baffles. Adjustable and Removable. Our baffles are not welded into place, so they can be easily removed when necessary.
- Hydro Tested to 60lbs PSI
- Constructed of 3/4" Steel Plate Throughout
- Samson Non-Electric Automatic Draft Regulator (Except Models C100 and larger)
- Honeywell Circulator Control Aquastat
- Temperature/Pressure Gauge
- ASME Tested Pressure Relief Value
- AHS Multi fuel boilers can be set up to run without electric using the
Samson control.
Specifications:
Our Multi-Fuel Boilers are not to be confused with "converted" or "re-designed" single fuel equipment. Every Alternate Heating Systems, LLC. Boiler boasts design and engineering to operate efficiently and dependably on Wood, Coal, and Fuel Oil or Natural Gas/Propane.
Boiler Model Nomenclature
The following letters are used in designating boiler models and have the following meanings.
- WC - Wood/Coal burning
- WOC - Wood/Coal/Oil burning
- Multi-Fuel (Coal/Wood) Boiler Specifications*
| Model: |
WOC40 |
WOC55 |
WOC70 |
WOC100 |
| BTU/hr Wood |
120,000 |
180,000 |
220,000 |
350,000 |
| Coal |
150,000 |
225,000 |
265,000 |
400,000 |
| Oil (MAX)* |
225,000 |
225,000 |
250,000 |
400,000 |
| Heating Surface |
20 Ft2 |
32 Ft2 |
33 Ft2 |
56 Ft2 |
| Water Capacity |
40 |
59 Gal. |
70 Gal. |
100 Gal. |
| Firebox CapacityFirebox Capacity |
7.5 Ft3 |
10Ft3 |
14 Ft3 |
22 Ft3 |
| Coal Capacity |
125 lbs |
200 lbs |
250 lbs |
400 lbs |
| Max. Log Length |
24" |
24" |
36" |
38" |
| Door Opening |
14" x 14" |
14"x14" |
14"x14" |
16"x16" |
| Height |
50" |
54" |
59" |
64" |
| Width |
28" |
28" |
28" |
34" |
| DepthDepth |
40" |
48" |
40" |
62" |
| Flue Height (to ctr) |
45" |
45" |
45" |
50" |
| Flue Size |
8" |
8" |
8" |
8" |
| Weight (lbs) |
1,230 |
1,400 |
1,450 |
2,130 |
Multi-Fuel (Coal/Wood) Boiler Specifications*
| Model: |
|
|
WC40 |
WC55 |
WC70 |
WC100 |
| BTU/hr Wood |
|
|
120,000 |
180,000 |
220,000 |
350,000 |
| Coal |
|
|
150,000 |
225,000 |
265,000 |
400,000 |
| Heating Surface |
|
|
20 Ft2 |
27 Ft2 |
33 Ft2 |
50 Ft2 |
| Water Capacity |
|
|
40 Gal. |
55 Gal. |
70 Gal. |
95 Gal. |
| Firebox Capacity |
|
|
7.5 Ft3 |
10 Ft3 |
14 Ft3 |
22 Ft3 |
| Coal Capacity |
|
|
125 lbs. |
200 lbs. |
250 lbs |
400 lbs. |
| Max. Log Length |
|
|
24" |
24" |
36" |
38" |
| Door Opening |
|
|
14" x14" |
14" x14" |
14"x14" |
16" x16" |
| Height |
|
|
44" |
54" |
59" |
64" |
| Width |
|
|
28" |
28" |
28" |
34" |
| Depth |
|
|
36" |
36" |
40" |
50" |
| Flue Height (to ctr) |
|
|
35" |
45" |
45" |
50" |
| Flue Size |
|
|
8" |
8" |
8" |
8" |
| Weight (lbs) |
|
|
1,050 |
1,220 |
1,450 |
1,950 |
*Specifications and design subject to change without notice. All specifications shown are approximate.
Producing More BTU's
If more BTU's are needed than the maximum produced by one of our boilers, then two or more boilers may be used together to produce the amount of BTU's needed.
Photos:
 
Optional Equipment on AHS Multi-Fuel Heaters/Boilers:
- RIELLO OIL BURNER. This is a new option and is the red unit shown in the photo above. The Riello oil burner option is an excellent choice for burning oil in combination with burning other fuels - it is designed to let almost no air into the combustion chamber when not burning oil.
- Domestic coil, factory installed (5 Gal. per min. max. output.)
- 4" fitting, for coil, includes 4" pipe plug
- Load door smoke flap
- Auto switch over
- Master grate rotator - this provides a single handle can be moved back and forth to rotate or shake all grates simultaneously
- Options for Burning Bituminous (Soft) Coal:
- Soft coal linkage kit
- Heavy duty refractory side brick
- Water-cooled baffle supports with refractoryForced draft with electric damper (comes with control wiring that provides the option of using natural draft or the quick response forced draft fan)
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