Short answer
Water heaters made on or after May 6, 2029 must meet DOE's 2024 standard. Electric tanks of 20 to 55 gallons must reach a UEF of 2.30, a level only heat pump models hit. Gas tanks get a moderate increase, not a ban. Congress cancelled the separate gas tankless rule in 2025. Nothing changes for heaters already installed.
Key facts
- From May 6, 2029, electric storage water heaters of 20 to 55 gallons (other than the small-tank class) must reach a UEF of 2.30; today's minimum for a 50-gallon medium-draw tank works out to about 0.92.[1]
- DOE expects more than 50% of new electric storage water heaters to use heat pumps under the rule, compared with 3% when it was finalized.[2]
- DOE withdrew the gas-fired tankless rule as of May 20, 2025, after Congress disapproved it under the Congressional Review Act.[3]
The short version
| Water heater type | What changes | When |
|---|---|---|
| Electric tank, 20 to 55 gal (most homes) | Minimum UEF jumps to 2.30, a heat pump level[1] | Units made on or after May 6, 2029[3] |
| Electric tank, over 55 to 120 gal | Minimum UEF rises to 2.50[1] | May 6, 2029 |
| Small electric tank class, 20 to 35 gal, very small and low draw | Stays at roughly today's resistance level[1] | May 6, 2029 |
| Gas tank, 20 to 55 gal | Moderate increase in the UEF formula[1][2] | May 6, 2029 |
| Gas tankless | No new federal standard; the 2024 rule was withdrawn[3] | Withdrawn May 20, 2025 |
What the 2024 rule is
DOE published its final rule for consumer water heaters on May 6, 2024, at 89 FR 37778[4]. The rule took effect July 5, 2024, and manufacturers must comply for units made on or after May 6, 2029[3]. Nothing in the rule forces a homeowner to replace a working heater.
The standard is written in UEF, or uniform energy factor. UEF is the efficiency number DOE's test procedure produces for each model, and it is printed in the specs and on the yellow EnergyGuide label. Higher is better. A UEF above 1.0 is possible only for a heat pump, because it moves heat from the air instead of making it.
Electric tanks: the big change
This is the part that matters for most electric homes. For tanks of 20 to 55 gallons, the 2029 standard is a flat UEF of 2.30 for every draw pattern[1]. For comparison, today's minimum for a 50-gallon medium-draw electric tank uses the formula 0.9307 minus 0.0002 times the rated volume[1]. That works out to about 0.92. No resistance element can reach 2.30, so in practice a standard size electric tank built after the deadline will be a heat pump (hybrid) unit.
DOE's own description: standards for electric storage "in the most common sizes" reflect the efficiency of an entry-level heat pump[2]. DOE expects more than 50% of newly made electric storage water heaters to use heat pumps, compared with 3% when the rule was finalized[2]. It estimates a household that swaps a resistance tank for a heat pump model meeting the standard saves about $1,800 on utility bills over the life of the heater[2].
Two exceptions matter:
- Small electric tanks. The 2029 table keeps a separate class for 20 to 35 gallon electric tanks in the very small and low draw patterns. Its formulas stay close to today's resistance-level standard[1]. That leaves room for small units in apartments and tight spaces.
- Large electric tanks. Tanks over 55 gallons already had to meet heat pump levels under the current standard. In 2029 the bar rises to a flat 2.50[1].
Gas tanks: a moderate increase, not a ban
A common claim online is that DOE is banning gas water heaters. It is not. DOE calls the change for gas-fired, oil-fired and larger electric storage units "a moderate increase in efficiency"[2].
The numbers show how modest it is. For a 20 to 55 gallon gas tank in the medium draw pattern, the formula moves from 0.6483 minus 0.0017 times volume today to 0.7046 minus 0.0017 times volume in 2029[1]. For a 40-gallon tank, that is roughly 0.58 today and 0.64 in 2029. One technical note: the 2029 formulas use effective storage volume rather than rated volume, so the exact result for a given model will differ a little[1]. Gas tanks over 55 gallons keep the same formulas[1].
Which gas tank designs meet the new floor is up to each manufacturer. Compliant models will reach stores and supply houses closer to the 2029 date.
Gas tankless: the rule that was cancelled
DOE also finalized a separate rule for gas-fired tankless water heaters in December 2024, which would have applied from December 26, 2029[3]. DOE delayed it twice in 2025. Congress then disapproved it through H.J.Res.20, signed May 9, 2025 as Public Law 119-6[5]. DOE withdrew the rule as of May 20, 2025[3]. In its September 2025 regulatory agenda, DOE listed the consumer water heater rule as complete for every class except gas tankless, and said it is still considering standards for that class[6].
So there is no new federal efficiency standard coming for gas tankless units. If someone tells you to buy a tankless now "before the ban," that claim is out of date.
Has anything changed in 2025 or 2026?
As of October 6, 2026, DOE's consumer water heater page still lists the May 6, 2029 compliance date for storage water heaters and shows no delay or withdrawal for that rule[3]. We found no proposal in the Federal Register to change it. That could change, and we will update this page if it does.
Do not confuse the home rule with the commercial one. In May 2026 DOE said it will not enforce new thermal efficiency standards for commercial gas storage and tankless water heaters and hot water supply boilers made from October 6, 2026 until October 6, 2027[7]. That policy covers commercial equipment, not the heater in a typical house.
What this means if you are buying now
- Electric tank, buying before 2029. You can still buy and install a standard resistance tank. Weigh it against a heat pump model, which is already available and must meet ENERGY STAR's 3.30 UEF floor for integrated units[8].
- No 240-volt circuit or tight space. ENERGY STAR also certifies 120-volt plug-in heat pump models at a 2.20 UEF floor[8]. See our heat pump vs standard electric guide.
- Gas tank. Expect more efficient models over time, not a forced switch away from gas.
- Tankless. No federal rule change is coming for gas tankless.
- Credits. The federal 25C tax credit ended for installs after 2025. See federal tax credit status.
When to call a pro
- To check whether a heat pump model fits your space, drain access and electrical setup before you buy.
- To compare a replacement now against waiting, given the age of your current tank. Our repair or replace guide covers the math.
- To confirm the permit and code items for a switch from gas or resistance electric to a heat pump.
More questions
Will I have to replace my current water heater in 2029?
No. The standard applies to water heaters manufactured on or after May 6, 2029. It does not require anyone to remove a working heater, and units made before that date can still be sold and installed.
Is the 2029 rule being delayed or repealed?
As of October 6, 2026, we found no delay, withdrawal or enforcement pause for the consumer storage rule. DOE's status page still lists May 6, 2029. The only consumer water heater rule withdrawn was the separate gas tankless rule. We will update this page if that changes.
Sources
- 10 CFR 430.32(d), energy conservation standards for water heaters (Tables 13 and 14), Legal Information Institute, Cornell Law School. Accessed 2026-10-06.
- DOE finalizes efficiency standards for water heaters (Apr 30, 2024), U.S. Department of Energy. Accessed 2026-10-06.
- Consumer water heaters: rulemaking status, U.S. Department of Energy. Accessed 2026-10-06.
- Energy conservation standards for consumer water heaters, final rule, 89 FR 37778 (May 6, 2024), Federal Register. Accessed 2026-10-06.
- Public Law 119-6 (H.J.Res.20), disapproval of the gas-fired instantaneous water heater rule, U.S. Government Publishing Office. Accessed 2026-10-06.
- Spring 2025 Unified Agenda of Regulatory and Deregulatory Actions, Department of Energy (90 FR 45506, Sep 22, 2025), Federal Register, via U.S. Government Publishing Office. Accessed 2026-10-06.
- Commercial water heater enforcement policy (May 5, 2026), U.S. Department of Energy, Office of the General Counsel. Accessed 2026-10-06.
- ENERGY STAR water heater key product criteria, ENERGY STAR (U.S. EPA). Accessed 2026-10-06.
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