A new water heater is generally not tax deductible in 2026, and it no longer qualifies for a federal tax credit. The Energy Efficient Home Improvement Credit and the Residential Clean Energy Credit, which together covered high-efficiency and solar water heaters, both expired on December 31, 2025. If you installed a qualifying unit before that date and have not yet filed your 2025 return, you can still claim the credit. If you own rental or business property, you recover the cost through depreciation. For everyone else, the cost adds to your home’s basis and may reduce your taxable gain when you sell.
A Water Heater Installed in Your Home in 2026
There is no credit and no immediate deduction for a standard water heater you install in your own home this year. The One Big Beautiful Bill Act, signed on July 4, 2025, ended the Section 25C Energy Efficient Home Improvement Credit for any property placed in service after December 31, 2025, and ended the Section 25D Residential Clean Energy Credit for any expenditures made after that same date.1Internal Revenue Service. One, Big, Beautiful Bill Provisions Paying in 2025 does not preserve the credit if installation finished in 2026.2Internal Revenue Service. FAQs for Modification of Sections 25C, 25D, 25E, 30C, 30D, 45L, 45W, and 179D Under Public Law 119-21
What the cost does do is increase your home’s adjusted cost basis, the figure the IRS uses to calculate your profit when you sell. Buy a home for $300,000, spend $3,000 on a new water heater, and your basis becomes $303,000. Sell for $550,000 and your taxable gain is $247,000 instead of $250,000. For most sellers this is academic, because the capital gains exclusion covers up to $250,000 in profit for single filers and $500,000 for married couples filing jointly.3Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence The basis adjustment matters when your gain exceeds those thresholds, which is more common than people expect after decades of ownership or in a market that has run hard.
Save the receipt and proof of installation. The IRS expects property records to be kept for the entire time you own the home, plus at least three years after you file the return for the year you sell.4Internal Revenue Service. How Long Should I Keep Records A scan in cloud storage is enough.
If You Installed a Qualifying Unit in 2025
The credit is still claimable on your 2025 return if the installation was completed by December 31, 2025. You file IRS Form 5695, Residential Energy Credits.5Internal Revenue Service. Instructions for Form 5695 (2025) The credit was 30 percent of purchase and installation cost, capped at $600 for high-efficiency gas, propane, or oil units and $2,000 for heat pump water heaters. Solar water heating systems were covered under a separate 30 percent credit with no dollar cap.
To qualify, a heat pump water heater needed a Uniform Energy Factor of at least 3.1, and a gas, propane, or oil unit needed a UEF of at least 0.82 or thermal efficiency of at least 90 percent. Subtract manufacturer rebates and utility subsidies from the cost before applying the 30 percent, because those reduce your qualifying expense. State incentives usually do not reduce the base unless they operate as a direct price adjustment.6Internal Revenue Service. Energy Efficient Home Improvement Credit Hold onto the manufacturer’s certification statement, purchase receipt, and installation records; the IRS can request them in an audit even though you do not file them with the return.7Internal Revenue Service. How To Claim an Energy Efficient Home Improvement Tax Credit – Residential Energy Property
Water Heaters in Rental or Business Property
A water heater in a rental unit or commercial building is a business asset. The residential energy credits never applied to rental property, even in years when the credits existed for homeowners. Instead, you recover the cost through depreciation deductions against your rental or business income.
Residential Rental Property
Because a water heater ties into the plumbing, the IRS treats it as a structural component of the building. For residential rental property, structural components are depreciated over 27.5 years under MACRS. A $2,000 replacement produces roughly $73 a year in depreciation. The deduction is reported on Schedule E, along with the rest of your rental income and expenses.8Internal Revenue Service. Publication 527 (2025), Residential Rental Property Keep the invoice and installation proof for as long as you own the property, plus at least three years after you file the return for the year you dispose of it.4Internal Revenue Service. How Long Should I Keep Records
Nonresidential and Commercial Property
A water heater installed in an office, warehouse, or retail space depreciates over 39 years under MACRS for nonresidential real property.9Internal Revenue Service. Publication 946 (2025), How To Depreciate Property The yearly deduction is smaller, but tracking and reporting work the same way.
Section 179 and Bonus Depreciation
Section 179 lets you expense certain qualifying property in the year you place it in service, with a 2026 limit of $1,250,000. Congress added heating, ventilation, and air-conditioning property to the list of real property improvements eligible for Section 179. Whether a specific water heater qualifies depends on how it is classified. A unit that functions as part of the building’s heating system has a stronger case than a standalone tank serving only domestic hot water. Talk to a tax professional before claiming the full expense this way.
Bonus depreciation, restored to 100 percent for qualified property acquired after January 19, 2025, applies to assets with a recovery period of 20 years or less.10Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill A water heater classified as a 27.5-year or 39-year structural component sits well above that line, so bonus depreciation generally will not reach a standard replacement in a rental building.
A Narrow Medical-Necessity Exception
A water heater installation can qualify as a deductible medical expense when it is medically necessary for a specific condition and a physician recommends it. An example would be a system that delivers tightly controlled water temperatures for someone with a chronic skin disorder or severe immune deficiency.
The deductible amount is the cost minus any increase in your home’s value caused by the installation. If the unit cost $3,000 and your home’s value rose by $1,000, only $2,000 counts. If there is no increase in value, the full cost qualifies.11Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses You claim it as an itemized deduction on Schedule A, and only the portion of total medical expenses above 7.5 percent of your adjusted gross income is deductible.12Internal Revenue Service. Topic No. 502, Medical and Dental Expenses On an $80,000 AGI, the first $6,000 of medical costs produces no deduction. Between that floor and the home-value offset, few taxpayers end up with a meaningful write-off here. If you take this route, keep the physician’s written recommendation and an appraisal showing your home’s value before and after the work.
Records to Keep
The paper trail protects every version of this. Hold onto:
- Purchase receipt and invoice showing the cost of the unit and any separately stated labor.
- Proof of the installation date, such as a contractor’s completion certificate, permit sign-off, or dated invoice. This matters for depreciation start dates and for proving that a 2025 installation qualified for the now-expired credit.
- Manufacturer’s certification statement, if you are claiming a 2025 energy credit. ENERGY STAR-labeled products often include it in the box or online.
- Physician’s letter, only if you are pursuing the medical expense deduction.
The general IRS rule is three years after you file the return the records support. For capital improvements to a home you own, that stretches to at least three years after filing the return for the year you sell.4Internal Revenue Service. How Long Should I Keep Records For a home you own for twenty years, that means keeping a water heater receipt for more than two decades. Digital storage makes it painless.