How do i return an item to mr heaterheatstar? This is an office address and not the warehouse. If you need to return any products, please contact us using the form below to process a RMA. MR. HEATER/HEATSTAR TECHNICAL SUPPORT & WARRANTY INQUIRIESHow do i get a part number for a buddy heater? If you need technical support or help with obtaining a part number, you need to first contact Mr. Heater / HeatStar at the numbers above. There have been a few model changes this year to our Buddy line of heaters.Is mr mr heater a fuel burning appliance? Mr. Heater is, indeed, “a fuel-burning appliance.” But here’s the safety point. Enerco in the literature provided with the heaters it sells points out that their heaters must be used with adequate ventilation.Why choose mr waterheater for your water heater replacement? Have the hot water you need, when you need it. True to their name, Mr. Waterheater offers comprehensive water heater replacement and repair services, ensuring your household always has hot water. Whether it's time to replace your outdated system or it simply needs a tune-up, leave the job to these professionals for superior results.