EcoTemp 80% Single Stage 70K BTU Gas Furnace, WFER070B036C
The WFER070B036C puts 66,000 BTUH of natural gas input and 54,000 BTUH of output into the industry-standard 17-1/2 in. furnace cabinet — the width that lines up with the largest share of existing plenums and coil cases in the field. Three monoport burners fire on hot surface ignition under an electronic control center with LED diagnostics, and a 1/3 HP five-speed blower with an 11 x 8 in. wheel handles up to 3 tons of cooling. Its certified 35°F to 65°F temperature rise band is the widest-shifted in the 70K group, which gives an installer more room to dial in a duct system that runs a little warm.
Is a 70K BTU Gas Furnace the Right Size?
Sixty-six thousand BTUH of input serves the broad middle of the residential market — typical three-bedroom homes in moderate climates, or larger well-insulated houses further south. Output lands at 54,000 BTUH at 80.00% AFUE, with the blower rated 985 CFM on the heating tap and 1005 CFM on cooling.
Where the 070B036 differs from its 14-3/16 in. sibling is not capacity but geometry and airflow behavior. The wider cabinet mates directly to a 17-1/2 in. coil case and 16 in. bottom inlet without a transition, and its temperature rise is certified from 35°F to 65°F rather than 30°F to 60°F. Run a heat loss calculation, then check that the duct system can hold rise inside that band at the selected speed tap. Restrictive returns and undersized supply trunks are the usual reason a correctly sized furnace still runs hot.
Ideal for: Standard 17-1/2 in. plenums and coil cases, three-bedroom single-family homes, moderate-climate changeouts, and installations where the furnace has to bolt to an existing 16 in. bottom return opening.
Need more capacity? Step up to the 90K BTU EcoTemp WFER090B042C Gas Furnace, which holds the 17-1/2 in. cabinet and adds 22,000 BTUH plus a 3.5 ton blower.
Recommended applications are general guidelines only. Actual furnace selection depends on a calculated heat loss, duct design, venting, gas supply and local code. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Model Number | WFER070B036C — 80% AFUE Single Stage Multipoise Gas Furnace |
|---|---|
| Heating Input | 66,000 BTUH (Natural Gas) |
| Heating Output | 54,000 BTUH |
| Efficiency | 80.00% AFUE |
| Cabinet Width | 17-1/2 in. |
| Cooling Size | Up to 3 Ton / 36,000 BTUH |
| Airflow | 985 CFM Heating / 1005 CFM Cooling |
| Blower Motor | 1/3 HP Direct Drive, 5 Speed, 11 x 8 in. Wheel |
| Burners | 3 Monoport |
| Certified Temperature Rise | 35°F – 65°F |
| Installation Positions | Upflow, Downflow, Horizontal-Left, Horizontal-Right |
| Ignition | Hot Surface Ignition |
| Electrical / Gas Connection | 115V-60Hz-1Ph, 5.6 Max Amps / 1/2 in. NPT |
| Vent Connection | 4 in. |
| Shipping Weight | 120 lb |
| Warranty | 1-Year Unit Replacement, 20-Year Heat Exchanger, 5-Year Parts (10-Year with Registration) |
The matching 17 in. accessories are external bottom filter rack NAHB00601FF, which ships with a 16 x 25 in. washable filter, and return air kit NAHA01701RA. This is the standard-NOx WFER build; the equivalent low-NOx model for 40 ng/J emission districts is the EcoTemp WFEL 70K BTU furnace. Pair it with a 3 ton cased coil, or shop complete condenser, furnace and coil systems.
Furnace & Blower Features
WFER070B036C Heating & Controls
- 66,000 BTUH input and 54,000 BTUH output at 80.00% AFUE
- Three monoport burners with hot surface ignition
- Electronic control center with LED diagnostics and self-test feature
- Certified temperature rise 35°F to 65°F, adjustable at the speed taps
- WhiteRodgers redundant gas valve, 1/2 in. NPT connection
- Certified for natural gas from 0 to 10,000 ft with a size 43 orifice
- Solid state time operation heating blower control
- 20-year heat exchanger limited warranty
- Cabinet air leakage under 1.4% at 0.5 in. w.c. per ASHRAE 193
- Standard NOx configuration, AHRI certified
WFER070B036C Cabinet & Airflow
- 17-1/2 in. cabinet width matching standard plenums and coil cases
- 15-7/8 in. supply outlet, 16 in. bottom inlet width
- 1/3 HP five-speed direct drive blower with an 11 x 8 in. wheel
- 985 CFM heating and 1005 CFM cooling as shipped
- Five selectable speed taps documented in the air delivery table
- Certified external static pressure 0.12 heating / 0.50 cooling
- Four-position installation with no field conversion kit required
- 4 in. vent connection, Type B-1 vent compatible
- 5.6 max amps, 7.8 ampacity, 40VA transformer
- 120 lb shipping weight
Specifications & Manuals
Size 070B036 appears in the physical data table and in the air delivery chart, which lists CFM for all five speed taps from 0.1 through 1.0 in. w.c. external static. Use that chart to select the tap that holds temperature rise inside the certified band.
Frequently Asked Questions
What is the difference between WFER070B036C and WFER070A036C?
Same 66,000 BTUH input, same 3 ton cooling size. The B is a 17-1/2 in. cabinet and the A is 14-3/16 in. The B also carries a 35°F to 65°F certified rise versus 30°F to 60°F, and weighs 120 lb against 114 lb.
What temperature rise is the 070B036 certified for?
35°F to 65°F. Adjust the blower speed tap as needed to land inside that range for your specific duct system — the installation instructions call this out as a required commissioning step.
What blower motor does this furnace use?
A 1/3 HP direct drive motor with five speeds at 1050 nominal RPM, turning an 11 x 8 in. wheel. Full load amps are 4.4.
Does the furnace include a filter?
A filter is required on each return-air inlet but is not built into the furnace. The 17 in. external bottom filter rack NAHB00601FF includes a 16 x 25 in. washable filter, and NAHA00506FB is a six-pack of 1 in. 16 x 25 washable media. Browse filtration options.
Is this furnace approved for low-NOx emission districts?
No. WFER is the standard NOx build. The WFEL variant is the one that can be installed in air quality management districts with a 40 ng/J NOx emissions limit — check your local requirement before ordering.
What control power does the furnace supply?
A 40VA 24-volt transformer, with 12VA of external control power available in heating and 35VA in cooling. An air conditioning blower relay is standard, so no separate fan relay is needed for the cooling side.
WFER Technical Specifications
