Allmand Maxi-Heat 1MBTU manufacturer equipment photo

Indirect Fired Heaters

Allmand Maxi-Heat 1MBTU — CAT C1.1 — Towable Indirect-Fired Heater

Name: Allmand Maxi-Heat 1MBTU — CAT C1.1 — Towable Indirect-Fired Heater
Brand: Allmand

The Allmand Maxi-Heat 1MBTU uses two independently operating indirect-fired heater units, each rated at 500,000 BTU/h. Maximum heated airflow is 7,060 cfm total, or 3,530 cfm per heater. This reference configuration specifies the Caterpillar C1.1 Tier 4 Final engine with an 8-kW, single-phase generator. The factory documents a 210-gallon poly tank and optional steel or multi-tank configurations. The current manual’s towing drawing gives overall dimensions of 183.4 by 80.2 by 83.9 inches to the chimney. Individual heater fuel and engine fuel requirements are listed separately.

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Specifications

Equipment

Manufacturer: Allmand
Model: Maxi-Heat 1MBTU — CAT C1.1

Equipment specifications

Nominal heat rating, total / per heater: 1,000,000 / 500,000 BTU/h
Maximum heated airflow, total / per heater: 7,060 / 3,530 cfm
Heater units: Two MCS500iQ-R indirect-fired units
Generator rated prime output: 8 kW / 8 kVA
Generator supply: 120/240 VAC, single-phase, 60 Hz
Engine configuration: Caterpillar C1.1; EPA Tier 4 Final
Engine prime power at 1,800 rpm: 13.8 HP / 10.3 kWm
Engine cylinders / displacement: 3 cylinders / 1.131 L
Engine aspiration / cooling: Naturally aspirated / water-cooled
Engine fuel injection: Indirect injection
Engine starting aid: Glow plugs
Engine alternator: 40 A
Engine fuel: ULSD meeting ASTM D975; No.1-D or No.2-D
Engine oil capacity with filter: 4.3 US qt
Engine coolant capacity: 4.7 US qt
Coolant overflow reservoir: 1.1 US qt
Engine service interval, oil/filter: 1,000 h
Engine low-oil-pressure shutdown: 10 psi
Engine high-coolant-temperature shutdown: 234°F
Heater-approved fuel: No.1 diesel, No.2 diesel or kerosene
Heater electrical requirement, each: 120 V, 60 Hz, 15 A, single-phase
Maximum outlet temperature, automatic mode: 230°F
Maximum outlet temperature, manual mode: 300°F
Maximum published temperature rise: 185°F
Static pressure: 3.1 in water column
Standard duct flange: 16 in
Optional duct flanges: 20 in or dual 12 in
Documented duct performance, per heater: 3,350 cfm with 96°F rise at 125 ft
Fuel tank, single-poly configuration: 210 US gal; rotationally molded polyethylene
Containment, single-poly configuration: 200%
Operating weight without fuel, single-poly configuration: 4,000 lb
Fuel tank, optional single-steel configuration: 175 US gal; double-wall UN-31A steel
Containment, single-steel configuration: 240%
Operating weight without / with full fuel, single-steel configuration: 4,450 / 5,750 lb
Optional multi-poly tank configuration: 50-US-gal engine tank and two 116-US-gal heater tanks
Containment, multi-poly configuration: 151%
Towing dimensions, L × W × H to chimney: 183.4 × 80.2 × 83.9 in
Frame height for towing: 77.7 in
Track width / ground clearance: 70.9 / 9.1 in
GVWR, 2025 RevisionG manual: 6,500 lb
Axle rating: 7,000 lb
Tires: ST235/80R16E
Trailer brakes: Electric brakes with breakaway system
Standard hitch: Combination 2-in Bulldog coupler / 3-in lunette
Trailer lighting connection: 7-pin connector
Forklift pocket openings: 5 × 10 in
Leveling-jack capacity: 5,000 lb
DC starting system: 12 V; one Group 24 AGM battery, 775 CCA at 0°F
Generator regulation: Automatic voltage regulator
Generator construction: Four poles; 1,800 rpm