Rheem GNU100-200 Low NOx Universal 100 Gallon Commercial 199900 BTU Water Heater – Wholesale Water Heater

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RHEEM GNU100-200 Universal Low NOx 100 Gallon Commercial 199,900 BTU Water Heater Natural Gas

  • Brand: Rheem
  • Availability: In Stock
  • SKU: GNU100-200



  • Description
  • Specifications
  • Comparable Brands

Commercial 100 Gallon Universal Low NOx 199,900BTU Natural Gas Water Heater; Brand: Rheem; Model #: GNU100-200; Series: Rheem Universal; Automatic Flue Damper; Direct Spark-to-Pilot Ignition System; 3-Year Limited Tank Warranty; Space Saver Design; Used in Motels, Hotels, Gyms, Schools, Restaurants, and Businesses.

BrandRheemWeight780 lbsHeight73 1/16"
ModelGNU100-200Gallons100 galDiameter30 1/4"
Warranty3 YearsBTU199,900 BTUVent Size6"
Fuel TypeNatural GasEfficiency80%Vent TypeStandard


A.O. SmithBTN-200199,00010080%27-3/4"72"
Bradford WhiteUCG-100H-199-3N199,99910084%28-1/4"73-1/4"
Bradford WhiteD-100L-199E-3N199,99910080%30-1/4"75"
Bradford WhiteD-100S-199E-3N199,99910080%30-1/4"76-3/4"
StateSBN100 199NES199,00010080%27-3/4"72"
StateSBN100 200NES199,00010080%30-1/4"72"


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Specifications Manual Brochure Warranty

Universal Low NOx and Ultra Low NOx gas commercial water heaters are specifically designed to minimize the difficulty of replacing failed water heaters and are versatile for new installations. These products comply with our country’s air quality legislation.

SPACE SAVER DESIGN The short heights and narrow jacket diameters, plus the top, front and rear water inlets/outlets offer the ultimate in installation flexibility.

PATENTED MULTI-FLUE TANK DESIGN Patented multi-flue design, and two coats of high temperature porcelain enamel to maximize corrosion resistance result in a superior heat exchanger design.

LOW PROFILE AUTOMATIC FLUE DAMPER Low profile design minimizes overall product height. Heavy duty vent hood supports are designed to withstand rigors of installation.

DIRECT SPARK-TO-PILOT IGNITION SYSTEM Standard on all models. Energy saving ignition that ignites pilot only when there is a call for heat.



HAND-HOLE CLEANOUT For removal of lime/sediment deposits.

MANUAL RESET HIGH LIMIT All ASME models are factory equipped with a manual reset high limit to meet the code requirements of many states.

PATENTED ANODE RODS Anode design utilizes multiple magnesium rods to ensure corrosion resistance for a long tank life.

LOW NOX BURNER The power assist burner design incorporates stainless steel multi-port burner tubes for long term low NOx performance, less than 40 ng/J. A sight glass allows for burner observation. A blower guard provides protection against potential post-installation damage.

ULTRA LOW NOX BURNER The power assist burner design incorporates stainless steel multi-port burner tubes for long term ultra low NOx performance, less than 14 ng/J. A sight glass allows for burner observation. The entire design is removable and it is highly resistant to the effects of negative air pressure common in modern commercial buildings.

ULTRA LOW NOx BASE RAIL Provides for better handling when moving and positioning unit.

WARRANTY 3-year limited tank warranty.

Shipping Guarantee

All of our freight shipments have a shipment guarantee! This means that if your water heater arrives later then the estimated delivery window shown on the product page we will credit you $100 upon delivery. 

How long does shipping take?

Shipping times can vary from water heater to water heater, however most in stock shipments will arrive in 2-5 business days depending on how close the warehouse is to the shipping address. On each product page we give an estimated delivery window which will show roughly when a product will arrive, if you need a better estimate please call into (313) 626-6800 and one of our customer support representatives can assist you. 

Expedited Shipping

A select number of our products are available for expedited shipping. If we offer expedited shipping on a product it will show the option at checkout. Cost and times will depend on your location and availability of the water heater. Most expedited shipments will arrive in 1-3 business days. All expedited shipments are shipped LTL and are only estimated delivery times. For any guaranteed expedited shipments/overnight shipments please contact our customer support team for a quote. 

Where do you ship from?

Our standard deliveries will ship from the closest warehouse to your shipping address. We have several warehouses in Michigan and can also ship out of any Rheem warehouses in the United States. Rheem has warehouses in Colorado, California, Florida, Texas, New Jersey, Alabama, and Illinois. Depending on availability and your location we will determine the best possible warehouse to ship from to ensure a timely delivery.

Do you deliver on weekends?

Deliveries, except for USPS, are not typically made on Saturdays or Sundays. This means any commercial water heater will not be shipped over the weekend.

Where do you ship?

We ship to the continental united states. Some products can be shipped to Alaska and Hawaii, but please contact us first to determine additional shipping cost and estimated delivery time.

Certain products are not available in Texas and California. If a product is excluded from certain states it will be noted in the product description. These products are not allowed in these states, so there are no exceptions to these exclusions.

Residential water heaters are not available for shipment. Please arrange for local pickup if needed.

Can I pick up my order?

Most orders are available for pickup at any of our warehouses in Detroit, Michigan. If you would like to pick up your order please select that option at checkout. Local pickups may be subject to a pickup fee. If your order is not being shipped from the manufacturer it is typically available the same day you place the order.

Can I track my shipment?

Once your order ships, you will receive a Ship Confirmation email, and have an option to receive email updates on the delivery status of your order. You will also receive a tracking number from the designated carrier for your shipment. If you do not receive this tracking number please contact us, and we will provide it to you.

If you're purchasing an item being dropshipped you will not receive tracking information until the product has been shipped from the manufacturer.

How will my shipment arrive?

Smaller parts and accessories will arrive to your porch or mailbox. Please note that tankless water heaters may require a signature upon delivery. 

For large items that cannot be shipped via standard UPS or FedEx services, we work with delivery companies to get your items to you. These partners deliver to your curb at the end of your driveway, and you are responsible for moving the items from there. Please note, if you live down a road or driveway that the delivery truck cannot access without causing damage to the truck we may need to make special arrangement for delivery, so please let us know. These carriers will call to schedule delivery so you can be home to inspect your items and accept delivery.

We recommend opening the boxes and inspecting the products for any signs of damage, such as broken parts or chips and cracks in the finish. While we do our best to make sure items are packaged safely and securely to prevent damage, we recognize that fragile products will occasionally break in transit to your doorstep. If you see any signs of damage, firmly refuse the damaged items and keep any that are in good condition. Do not let the driver leave without inspecting. If driver refuses to stay during inspection, sign "Subject to Inspection" on the delivery receipt and call us immediately to report damages.