Rheem Professional Classic Plus 40-Gallon Atmospheric Gas Water Heater

The Rheem Professional Classic Plus 40-Gallon Atmospheric Gas Water Heater (PROG40-38N-RH62) is the 40-gallon contractor-channel sibling of the PROG50-38N-RH60. Same FVIR-compliant burner, same 8-year warranty, same Rheem distributor service network — sized for 2–3 person households where a 50G would be over-spec.

Headline specifications

• Model: PROG40-38N-RH62
• Capacity: 40 gallons
• Fuel: Natural gas, atmospheric vent
• BTU input: 38,000 BTU/h
• First Hour Delivery: 70 GPH
• Recovery: 38 GPH at 90°F rise
• UEF: 0.62
• Warranty: 8-year tank and parts
• Anode: aluminum-zinc
• Drain valve: brass
• Dimensions: 56" H × 22" diameter
• FVIR-compliant Guardian burner

Who this model is for

The PROG40 is the right pick for: 2–3 person households on natural gas atmospheric venting, like-for-like 40G replacement, contractor-channel install, homeowners who want the 8-year warranty Rheem doesn't ship at the Performance Plus 40G big-box tier (6-year).

For 1–2 person households or very tight closet clearance, drop to the Performance 29G Compact. For 4+ person households or extended-family demand, step up to the PROG50. For DIY install at Home Depot, the Performance Platinum 40G ships 12-year warranty + EcoNet WiFi at similar price.

Where it beats the alternatives

Vs Performance Platinum 40G Gas ($949 Home Depot): PROG40 ~$50–$150 less from a Rheem-network plumber, 8-year warranty vs 12-year, no WiFi vs EcoNet. For pro-installed jobs where the plumber stocks Rheem, PROG40 is the natural channel pick.

Vs Performance Plus 40G ($749 Home Depot): PROG40 has the longer 8-year warranty vs Plus's 6-year. Otherwise spec-identical. The two are sold to different channels (contractor vs DIY) at similar retail.

Vs Bradford White Defender 40G ($899 plumber channel): Bradford White ships 6-year standard warranty (10-year with extension). Rheem PROG40 ships 8-year standard. Bradford White wins on plumber preference; Rheem wins on out-of-box warranty math.

Vs AO Smith Signature Premier 40G ($799 Lowe's): AO Smith 9-year warranty + Coregard anode (slower-depleting than magnesium/aluminum). Choose by retailer.

Where it falls short

0.62 UEF is class-baseline. Operating cost ~$230–$290/year for typical 2–3 person households.

Atmospheric venting limits closet and manufactured-home installs. For those, the Performance Power Vent 40G is the right pick.

38,000 BTU is on the low side of the class — 70 GPH FHD vs 75 GPH on 40,000 BTU competitors. Small for back-to-back-shower households.

No WiFi or smart-home features.

Contractor channel — DIY buyers must work through a plumber to source.

Install considerations

56" height + 22" diameter. Atmospheric flue inspection required. 1/2" gas line sufficient. No 120V outlet.

Install cost through Rheem-network plumber: $1,200–$2,100 turnkey for like-for-like swap.

Maintenance

• Annual flush
• Aluminum-zinc anode check year 3, replace year 5
• T&P valve test annually
• Burner inspection every 2 years
• Register warranty within 90 days at our Rheem warranty hub

Bottom line

The Rheem Professional Classic Plus 40G (PROG40-38N-RH62) is the contractor-channel volume Rheem 40G. 8-year warranty, FVIR-compliant burner, 70 GPH first-hour delivery for 2–3 person households. For DIY shopping or 12-year warranty preference, pivot to Performance Platinum 40G at Home Depot. For sealed-combustion install paths, see Performance Power Vent 40G.