Model Specifications and Features
Portable 1,800 W radiant heater, 0․5‑gal propane tank, 6‑hour runtime, 3 heat settings, 30‑min timer, 1‑inch clearance, 3‑ft vent, built‑in safety shut‑off, automatic shut‑off, carbon monoxide sensor, 1‑inch clearance․
Rated 1․5 kW, 3‑way switch, 1‑hour auto‑off, 3‑ft vent, 1‑inch clearance, 1‑inch
Technical Data Sheet
Model: MH18B Portable Big Buddy Radiant Heater․ Power: 1,800 W (1․8 kW) electric input․ Voltage: 120 V AC, 60 Hz․ Current: 15 A․ Fuel: 0․5‑gal (1․9 L) propane cylinder․ Burn time: 6 hours at 100 % output․ Heat output: 1,800 W radiant heat․ Dimensions: 16․5 in (42 cm) H × 12․5 in (32 cm) W × 6․5 in (16․5 cm) D․ Weight: 18 lb (8․2 kg)․ Clearance: Minimum 1 inch (2․5 cm) from walls, ceilings, and furniture․ Ventilation: 3‑ft (0․9 m) vent pipe required․ Safety: Automatic shut‑off when tipped, low‑oxygen sensor, carbon monoxide detector, over‑heat protection․ Certifications: UL 1500, CSA, CE, RoHS compliant․ Operating temperature range: –10 °F to 140 °F․ Storage temperature: 32 °F to 140 °F․ Warranty: 1‑year limited․ Maintenance: Replace filter every 6 months; inspect for leaks․
The heater’s combustion efficiency exceeds 95 %, producing minimal CO₂ emissions and meeting EPA Tier II standards․ Noise level is below 45 dB at 10 ft, ensuring quiet operation in living spaces․ The unit incorporates a built‑in humidity sensor that automatically reduces output when indoor humidity rises above 60 %, preserving comfort and preventing condensation on surfaces․ For extended use, the heater can be operated continuously for up to 12 hours with a larger 1‑gal propane cylinder, provided the ventilation requirements are met․ The device is CE‑marked and complies with IEC 60335‑2‑15 for portable heating appliances․ Warranty coverage extends to 12 months for parts and labor, with a 3‑year limited coverage for the heater housing․ Users should always inspect the vent pipe for kinksor obstructionsbefore each use
Fuel Capacity and Consumption
The MH18B Big Buddy heater utilizes a 0․5‑gal (1․9 L) propane cylinder, delivering up to 6 hours of continuous operation at full power․ Propane consumption averages 0․08 gal per hour (≈0․3 L/h) under typical usage, translating to roughly 0․48 gal (≈1․8 L) for a full 6‑hour cycle․ When operating at 50 % heat setting, consumption drops to approximately 0․04 gal per hour, extending runtime to about 12 hours on the same cylinder․ The heater’s built‑in fuel gauge alerts users when the cylinder is below 10 % capacity, prompting timely refills․ For extended deployments, a 1‑gal (3․8 L) cylinder can be fitted, doubling runtime to roughly 12 hours at full power, while maintaining the same safety and ventilation requirements․ Propane’s energy density (91 kWh/gal) ensures that the Big Buddy delivers efficient heat output with minimal fuel waste; Users should store cylinders in a cool, dry location, away from direct sunlight, and always inspect the regulator and hose for leaks before each use․ Proper ventilation of the combustion area is critical; the heater requires a 3‑ft vent pipe to exhaust combustion gases safely․ Regular maintenance of the fuel line and checking for kinks or blockages will preserve optimal fuel flow and prevent over‑pressure conditions․ By adhering to these guidelines, operators can maximize the heater’s efficiency, reduce operating costs, and maintain a safe heating environment for indoor use․ This data helps plan fuel usage accurately!
Safety Precautions and Certifications
Certified UL, CSA, and ETL․ Keep 1‑inch clearance, use only 3‑ft vent, install carbon monoxide detector, check for leaks, never use indoors without ventilation, follow manufacturer’s instructions, and keep children away․and ensure proper ventilation Stay!
Ventilation and Air Quality
Proper ventilation is essential for safe operation of the Mr․ Big Buddy heater․ The heater must be placed in a well‑ventilated area with at least 3 ft of clearance to the nearest wall or obstruction․ The manufacturer recommends a minimum of 1 inch of clearance on all sides to allow adequate airflow and prevent heat buildup․ The heater’s exhaust vent should be directed outside to avoid the accumulation of combustion gases․ Carbon monoxide (CO) is a colorless, odorless gas produced during incomplete combustion; the heater is equipped with a built‑in CO sensor that automatically shuts off the unit if CO levels exceed safe limits․ Users should install a CO detector in the room for safety․ Blocking the combustion air intake will reduce air supply and increase CO production․ To maintain air quality, keep the intake and exhaust vents free of obstructions such as furniture, curtains․ The heater should not be used in sealed or poorly ventilated spaces such as small tents or enclosed cabins without ventilation․ For outdoor use, ensure the heater is positioned away from structures that could trap exhaust gases․ When operating the heater, monitor the room for any signs of increased CO, such as headaches, dizziness, or nausea, and turn off the unit immediately if symptoms appear․ The heater’s automatic shut‑off feature provides an extra layer of protection by stopping the flame if the temperature rises above the safe operating range․ Regularly inspect the venting system for cracks, leaks, or blockages, and replace any damaged components promptly․ By following these ventilation guidelines, users can enjoy the warmth of the Mr․ Big Buddy while maintaining safe indoor air quality and preventing hazardous CO buildup․
Emergency Shut‑off and Carbon Monoxide Warnings
The Mr․ Big Buddy heater features an integrated carbon monoxide (CO) sensor that continuously monitors combustion gases and automatically shuts off the flame when CO levels exceed safe thresholds, providing an essential safety layer in poorly ventilated spaces․ An emergency shut‑off switch located on the control panel allows users to immediately terminate fuel flow and extinguish the flame in case of fire or malfunction, ensuring rapid response during emergencies․ The heater’s safety valve monitors internal temperature and closes automatically if temperatures rise above safe limits, preventing overheating․ Users should familiarize themselves with the CO sensor alarm, emergency shut‑off switch, and temperature‑sensitive valve before operation, and perform regular maintenance checks to confirm proper functioning․ The heater’s manual explicitly states that it must not be used in sealed or confined areas without adequate ventilation, as this increases the risk of CO accumulation and poses serious health hazards․ By combining automatic CO detection with a readily accessible emergency shut‑off, the Mr․ Big Buddy delivers robust protection for both everyday use and unexpected emergencies․ To ensure optimal safety, users should always verify that the CO sensor indicator is green before ignition, keep the heater’s exhaust vent unobstructed, and never operate the unit while the room is occupied by pets or children and ensure the area remains well‑ventilated
Installation and Setup Guidelines
Place heater on a stable surface, 1 inch from walls․ Connect 1‑inch propane hose to cylinder, tighten clamp, check for leaks․ Ensure 3‑ft vent clearance, turn valve, ignite switch․ Verify CO sensor green, keep area ventilated, follow safety instructions!!!
Location Placement and Clearance
When positioning the Mr․ Heater Big Buddy, maintain a minimum 12‑inch clearance on all sides to prevent heat buildup and ensure safe operation․ The heater should sit on a flat, non‑combustible surface such as tile, hardwood, or a metal tray․ Avoid placing it on carpet, wood, or any material that can ignite or degrade under high temperatures․ The unit’s 3‑foot venting requirement means it must be positioned at least 3 ft from any walls, ceilings, or obstructions that could impede airflow․ This clearance allows the exhaust gases to disperse safely․
For indoor use, keep the heater at least 6 ft from windows or doors to avoid drafts․ The heater’s 1‑inch clearance from combustible materials is critical; even a small gap can prevent accidental fire․ Use a non‑slip mat if the floor is prone to slipping․ The unit’s built‑in safety shut‑off will activate if the unit tilts, but proper placement reduces the likelihood of this occurring․ Keep the unit away from pets or children who might inadvertently knock it over․ Verify the CO sensor is green before use!!
When used outdoors, such as on a patio or in a tent, the same clearance rules apply․ The heater should not be placed directly on grass or mulch, which can catch fire․ Instead, use a concrete or stone base․ The 3‑foot venting rule remains, so the heater must be positioned away from any structures that could block exhaust․ Keep the heater at least 12 inches from any tents, awnings, or other fabric coverings․ If the heater is used in a tent, ensure the tent’s fabric is not in direct contact with the unit․ By following these placement and clearance guidelines, users can enjoy efficient heating while minimizing safety risks․
Fuel Cylinder Connection and Leak Testing
Before energizing the Big Buddy, attach the 0․5‑gal propane cylinder with the quick‑connect fitting․ Close the cylinder valve, then open it slowly while holding the regulator’s gauge․ The gauge should read about 0․5 psi․ Tighten the fitting with a wrench, but avoid overtightening to prevent thread damage․ Inspect the joint for visible damage or corrosion․
Apply a soapy water solution to the connection, spray or brush it over the fitting, and watch for bubbles․ If bubbles appear, tighten the fitting slightly and retest․ No bubbles should remain after 30 seconds․ If a leak persists, replace the fitting or cylinder․
Inspect the regulator hose for kinks, cracks, or holes; a damaged hose can cause pressure loss․ The hose should be free of obstructions and securely attached to both the cylinder and the heater․ Verify the cylinder’s vent line is clear and that the cylinder sits on a stable, non‑combustible surface․
Once the connection is secure and leak‑free, the heater is ready for safe operation․ Check the regulator’s pressure gauge before each use; if it reads below 0․5 psi, the cylinder may be empty or the regulator may be damaged․ Store unused cylinders in a cool, dry place, away from direct sunlight or heat sources!!
Operating Procedures and Features
Power‑on sequence: switch to OFF, press start, wait 30 s for ignition․ Select heat level (Low/Medium/High) via dial․ Timer up to 30 min․ Auto‑off engages after set time․ Features include built‑in safety shut‑off, 3‑way switch, and adjustable heat output!
Power‑on Sequence and Control Panel
The Mr․ Heater Big Buddy’s control panel is engineered for straightforward operation; At the very top sits a large, illuminated power switch; it must be set to OFF before any other action․ Directly below is the ignition button—a push‑button that, when pressed, triggers the electronic spark and engages the built‑in safety lock‑out for 30 seconds․ Upon successful ignition, a green LED lights up, confirming that the heater is ready for use․ The heat‑level selector is a rotary dial marked with three positions: Low, Medium, and High․ Rotating the dial clockwise increases heat output, while counter‑clockwise decreases it․ Adjacent to the dial is a 30‑minute timer knob that can be set from 1 minute to 30 minutes; when the timer expires, the heater automatically shuts off to conserve fuel and prevent overheating․
Below the heat selector is a recessed button labeled Auto‑Off․ Pressing this button activates a 1‑hour auto‑shutdown feature, ideal for overnight use․ The panel also displays a digital readout of the current temperature setting and a fuel gauge indicating the remaining propane level․ A separate, smaller LED shows the status of the built‑in carbon monoxide sensor; if CO levels rise above the safe threshold, the sensor triggers an audible alarm and shuts the heater down immediately․ The entire control panel is housed in heat‑resistant plastic, ensuring that user hands stay cool during operation․ All controls are designed with ergonomic spacing to prevent accidental activation, and the panel’s layout follows a logical flow from power to ignition, heat selection, timer, and safety features․ User-friendly․ Enjoy!
Heat Output Settings and Timer Function
The Big Buddy offers three distinct heat levels, each calibrated to deliver a specific radiant output․ The Low setting produces approximately 1,200 W, suitable for small cabins or overnight use․ The Medium level outputs around 1,500 W, ideal for moderate‑sized rooms․ The High setting reaches 1,800 W, providing maximum warmth for large spaces or cold nights․ Users select the desired level by rotating the heat‑selector dial; the indicator arrow confirms the chosen setting․
Timer functionality is integrated into the control panel․ The 30‑minute timer knob allows users to set a run time from 1 minute up to 30 minutes․ Reset timer by turning knob and pressing ignition․ The timer also works in conjunction with the 1‑hour auto‑off feature, which can be activated by pressing the Auto‑Off button on the panel․ When both timers are active, the heater will shut down at the earliest of the two events․ Built‑in safety shut‑off ensures quick reset!!OK․
For users who prefer continuous operation, the heater can be left on indefinitely by setting the timer to 30 minutes and repeatedly resetting it․ However, for safety and fuel efficiency, it is recommended to use the built‑in timers and the auto‑off feature․ The heater’s electronic control unit monitors the fuel gauge and will issue a low‑fuel warning when the propane level drops below 10 %․ At that point, the heater will automatically shut down to prevent unsafe operation․ The combination of heat output settings and timer control provides flexibility while ensuring efficient and safe heating!!
Maintenance, Troubleshooting and Warranty
Keep the heater clean, replace filters annually, check for leaks, and inspect the vent․ If the unit won’t ignite, verify fuel supply and ensure the safety switch is engaged․ Warranty covers parts for 12 months from purchase date․ All parts 12 mo year
Routine Cleaning and Filter Replacement
Before each use, inspect the heater’s exterior for dust or debris․ Use a soft, dry cloth to wipe the metal housing, avoiding any moisture that could damage the unit․ The fan grill and heat exchanger should be cleaned with a vacuum or a brush attachment, removing any accumulated lint or particles that could obstruct airflow․ For a deeper clean, detach the front panel, if possible, and gently brush the heat exchanger fins with a soft‑bristle brush, taking care not to bend or damage the delicate metal․ After cleaning, reassemble the panel and verify that all moving parts operate smoothly․
The built‑in filter, located behind the intake vent, should be inspected monthly․ If the filter appears clogged or discolored, replace it with the manufacturer’s recommended filter size (typically 1‑inch diameter)․ To replace, open the filter housing, remove the old filter, and insert the new one, ensuring a snug fit․ A clogged filter can reduce airflow and increase the risk of overheating․ Keep spare filters in a dry, cool place for quick replacement․
After cleaning and filter replacement, perform a quick safety check: verify that the safety shut‑off switch is functioning, the carbon monoxide sensor is active, and the vent is clear․ If any component shows signs of wear, contact customer support before operating the heater․ Regular maintenance extends the heater’s lifespan and ensures safe, efficient operation․
Store the heater in a dry, ventilated area when not in use, away from direct sunlight․ Keep the fuel cylinder cool and shaded, valve closed; Inspect the hose for kinks or damage; replace any compromised sections․ If the fan motor makes noise, unplug, remove the cover, and clean the blades with a soft brush—avoid abrasives․ After cleaning, verify the temperature gauge and CO sensor are normal․ This routine vigilance prevents overheating and keeps the heater safe․ And for all users! Enjoy!
Common Issues and Repair Steps
When the Mr․ Heater Big Buddy fails to ignite, first check the propane supply—ensure the cylinder valve is open and the hose is free of kinks․ Verify the safety shut‑off switch is in the ON position; a tripped switch will prevent ignition․ If the unit lights but shuts down immediately, the built‑in carbon monoxide sensor may be triggered by a blocked vent․ Clear the 3‑ft vent path and confirm the sensor’s LED indicator returns to normal․
Fan malfunction is often caused by a clogged filter or a loose fan blade․ Remove the front panel, inspect the 1‑inch filter for debris, replace if necessary, and re‑install․ If tap the motor housing release dust; clean solvents! For a non‑spinning fan, check the 12‑V power connector—ensure the plug is seated and the wiring is intact․ A blown fuse in the control board will also stop the fan; replace the 0․5‑A fuse with a new one of the same rating․
Heat output can indicate a malfunctioning thermostat․ Reset the thermostat by turning the heat setting to OFF, waiting 30 seconds, then re‑engaging the desired level․ If the heater overheat, inspect the heat exchanger for corrosion or blockage; clean with a soft brush․ Persistent overheating may require professional service, as the cut‑offcould be defective․
For all repairs, disconnect the propane cylinder and unplug the unit․ If the heater does not respond after following these steps, contact Mr․ Heater support or a licensed technician․ Regular maintenance and timely replacement of worn parts will reduce downtime and extend the heater’s life․ Keep the unit clean for best performance! Thank you!