30 Gallon Tank, Installed
30 Gallon Water Heater Installation Cost (2026)
DOE's average installed cost for a small electric water heater (20 to 35 gallons) is $780; for a 20 to 55 gallon gas tank it is $1,432 (2022 dollars, 89 FR 37778, 6 May 2024). The tank alone: Home Depot listed the Rheem Performance 30 gal medium electric at $459 on 13 Nov 2026.
Page updated 15 November 2026
Installed: product plus labour
DOE average installed cost
Average total installed cost per tank in the DOE consumer water heater final rule (89 FR 37778, 6 May 2024), in 2022 dollars. These are national averages across homes, not a quote.
| DOE product class | Current standard | Level required from 6 May 2029 |
|---|---|---|
| Small electric storage, 20 to 35 galFirst-hour rating under 51 gal; the 2029 rule keeps the current standard | $780 | No change |
| Gas storage, 20 to 55 galCovers 30, 40 and 50 gallon gas tanks | $1,432 | $1,578 |
Tank only, on the shelf
Home Depot price, 13 Nov 2026
Regular (non-sale) price read on homedepot.com with store Ellsworth, ME 04605. No installation, permit or haul-away.
- Rheem Performance 30 gal medium electricXE30M06ST45U1$459
We have not recorded a 30 gallon gas tank price; the 40 gallon page lists the nearest gas model.
What sits between the shelf price and a 30 gallon install bill is labour, fittings, venting or wiring, the permit and haul-away of the old tank. No national price list for that work is published (Home Depot's installation page gives no price), so get it as a written quote. For scale, the median US plumber earned $30.67 an hour in May 2025 (BLS); that is pay, not the rate a firm bills, which also covers the van, insurance, overhead and profit.
Right Use Cases
Where the 30 Gallon Tank Belongs
The 30 gallon tank is for places where a bigger tank will not fit or where demand is small: a studio or one-bedroom condo, an accessory dwelling unit, a garage apartment, a single-bath cabin. One person's shower and sink use sits comfortably inside it. Lowboy versions trade height for width so the same volume fits under stairs, in crawl spaces and in mobile homes.
It struggles where two people shower back to back or a shower overlaps the dishwasher or washing machine. For those households the 40 gallon water heater installation cost page is the better starting point: labour and connections are the same job, and only the tank changes.
Regulatory Context
The 2029 DOE Rule Leaves Small Electric Tanks Alone
The DOE consumer water heater final rule moves most electric storage tanks from 20 to 55 gallons to heat-pump efficiency for units made from 6 May 2029. It carves out small electric storage water heaters (20 to 35 gallons with a first-hour rating under 51 gallons), which keep the current standard. DOE costed a heat-pump version of that small class at $3,015 installed against $780 for the standard tank.
Gas storage tanks from 20 to 55 gallons get a higher minimum efficiency from the same date. DOE's average installed cost at the new level is $1,578, against $1,432 today, with first-year operating cost falling from $242 to $226 (2022 dollars).
The federal Section 25C tax credit ended for property placed in service after December 31, 2025, so no federal credit applies to a 2026 install at any size.
FAQ
30 Gallon Water Heater Cost Questions
How much does a 30 gallon water heater cost installed?
DOE's average installed cost for a small electric water heater (20 to 35 gallons) is $780, and for a 20 to 55 gallon gas tank $1,432, in 2022 dollars (DOE consumer water heater final rule, 89 FR 37778, 6 May 2024). The tank alone: Home Depot listed the Rheem Performance 30 gal medium electric at $459 on 13 Nov 2026. DOE's figures are national averages across homes; a written quote for your home is the only exact number.
Is a 30 gallon electric tank affected by the 2029 DOE rule?
No, if it is a small electric storage water heater in DOE's terms: 20 to 35 gallons with a first-hour rating under 51 gallons. The rule leaves that class at its current standard, so DOE's installed cost stays at $780. A heat-pump tank in the same class averages $3,015 installed in DOE's analysis, which is why DOE did not require it. Check the first-hour rating on the yellow label.
Who should buy a 30 gallon water heater?
Single occupants, accessory dwelling units, small condos, garage apartments and short-term rentals where only one hot-water task runs at a time. A household where two people shower back to back, or a shower overlaps the dishwasher, usually needs a 40 gallon tank.
How long does a water heater last?
DOE's analysis uses an average lifetime of 14.5 years for gas storage tanks and 15.1 years for electric storage tanks.
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