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Dr. Heater DR966 240-volt Hardwired Shop Garage Commercial Heater, 3000-watt/6000-watt
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- Heavy Duty 240V Single Phase 3000/6000W Commercial Electric Heater
- Hardwired; Power cord not included in the unit. Dimensions: Overall Height - Top to Bottom: -14.5". Overall Width - Side to Side: -13". Overall Depth - Front to Back: -14.5".
- UL/CUL Listed Wall or Ceiling Mounted Heater; Bracket Included
- Adjustable Thermostat with HIGH and LOW Setting. A dynamically 8 inch fan provide maximum air flow with minimum turbulence and noise, gently distributes warmth through your area
- 5 Adjustable Louvers for to Direct Airflow
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Need safe, comfort and quick heat? This DR966 3000/6000W industrial heater can be easily installed in either your new or remodeled building. Dr966 can be your primary or auxiliary heat source for your garage, factories, stores, warehouses, workshops, schools, churches, hospitals, dormitories or any exposed areas. DR966 uses spiral steel metal sheath electric heating elements with low sheath temperatures provide uniform heat and long service life. Plus a large, matched, dynamically 8" fan provide maximum air flow with minimum turbulence and noise, gently distributes warmth through your area. Totally enclosed, thermally protected, heavy duty ball bearing motor features permanently lubricated provides long life and low maintenance. Built-in adjustable thermostat allows to set your desire style. Rugged stamped steel front cover with five-way adjustable louvers for easy control airflow. Ceiling and wall mounting bracket are included. Finished in a gray epoxy paint. UL & CUL Listed. 1 Year parts and labor Warranty.
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So far I have only used this in the low 30's but it performs like I would expect. Within about an hour the room is warm enough that I don't need a jacket. After about two hours the built in thermostat begins kicking on and off.
This replaces a Dual Tank Top Propane heater that was listed at a max of 30k BTU's. I would not typically run that wide open because it burned way to much fuel way too fast that way. This unit is around the 20k BTU mark and heats the garage in a similar manor.
I have read some reviews where people seem to expect a stream of hot air similar to a big propane/kerosene bullet heater and that is not what you get. This is a steady stream of warm air that is going to take a bit to heat a space. That being said it does exactly what I want and for the money its seems to be the highest power/best cost combination I could find that also had mostly positive reviews.
Note: I am not an electrician so please consult a pro and don't take my word for anything:
One of the biggest points of confusion for me when deciding to order this unit was the conflicting reviews/posts some indicating the need for a 30 amp service and others a 35 amp services. I can confirm it requires a dedicated 35 amp service (not 30 amp).
If I am not mistaken this heater is considered a continuous load. With a continuous load you are only allowed to load a circuit to 80% of its listed capacity. At 6000 WATTS that's 25 amps. 80% of 30 amps is 24 not 25 amps and thus the need to go up to a 35 amp service.
With that in mind I can see why some people report plugging it into a 30 amp service with no problem but it would (in my limited understanding) be wrong and depending on circumstances potentially dangerous. Again don't take my word for it - the manual says 35 amps
The heater fan is loud in my opinion (can even hear it from the other side of the garage door). The fan operates at the same speed whether you have the thermostat set to High or Low and the wattage at 3000 or 6000 watts.
When set to 3000W on High you can barely feel heat coming from the fan but it did warm up the garage by 2 degrees in about 10 minutes when it was 31 degrees outside. On 6000W you can really feel the heat even standing 6 feet away, you know its running. The garage went from 48 to 64 in 2 hours when set to high on 6000W and it was just below freezing outside. After 2 hours on the highest settings, the temp of the heater box (the outside of it) was only 75 degrees but the coils were upwards of 200+ (I checked with a heat gun).
You must understand that you can only REALLY power off this unit by shutting off the breaker (or unplugging it if you wired a plug and outlet). There is no OFF button and the instructions clearly state that you'll need to shut it off by the breaker. Note; this doesn't necessarily mean that the unit will run all the time, it just won't actually be "OFF".
Wiring: I read at least 20 reviews about wiring and many many people said to use 10/2 wire with a 30 Amp breaker so that is what I ordered and as soon as I unboxed this unit it states all over it and in the instructions that you MUST use 8/2 wire and 35 Amp double pole breaker! There's one review on here from an apparent electrician who also states the same. I know the math doesn't really add up to going that route, but you cannot go wrong by following manufacturer instructions.
About the garage: It is 25' x 25' with 9'.9" ceilings. R-19 insulation (2x6 framing), 6 mil vapor barrier and 1/2" sheetrock on the 3 outside walls (one of which has two standard garage doors (hardly insulated) and a 28" fiberglass entrance door. The 4th wall is to the house which is fully insulated and has 5/8 fireblock etc.. The roof: R-30, 6 mil vapor barrier with foam rafter vents in the roof rafters (2x8) which is above the attic crawlspace and has 1/2" plywood floor which is over the garage ceiling which has 1/2" sheetrock.