Types of water heaters compared: tank, tankless, heat pump

The types side by side

Type	How it heats	Installed cost (HomeGuide, Jan 2026)	Typical life	Best fit
Gas tank	Burner under a stored tank	$600 to $3,100 for a standard 40 to 50 gal tank[2]	8 to 12 years[1]	Homes with gas, simple like-for-like swaps
Electric tank	Two resistance elements in the tank	Same standard tank range[2]	8 to 12 years[1]	Homes without gas, low upfront budget
Gas tankless	Burner fires only while water flows	$2,100 to $5,600 natural gas; $1,600 to $4,500 propane[4]	15 to 20+ years[1]	Long ownership, enough gas line capacity
Electric tankless	Large elements heat on demand	$1,400 to $3,000[4]	15 to 20+ years[1]	Small loads, or homes with a large electrical panel
Heat pump (hybrid)	Moves heat from room air into a tank	$2,000 to $4,600[2]	No maker figure found; ENERGY STAR units carry a 6-year minimum sealed system warranty[3]	Electric homes with space and a warm enough room
Solar	Collectors heat water, with backup	$3,000 to $9,000[2]	Varies by system	Sunny climates, long ownership
Indirect	Heated by a boiler through a coil	$2,000 to $4,500[2]	Varies by system	Homes that already have a boiler
Point-of-use	Small tank or mini tankless at one fixture	Varies by size	Varies	A distant bathroom or a single sink

Installed prices are national ranges, not quotes. A gas line upgrade, new venting or a panel upgrade can push any install well past them.

Storage tanks: gas and electric

A tank keeps a supply of water hot and ready. Its weak point is standby loss: heat escapes all day, even when no one uses hot water. DOE's Building America guide says a standard atmospheric gas tank burns about 40 therms a year just keeping its water hot^[5].

Gas tanks recover faster, so a smaller gas tank can match a larger electric one. Electric tanks have no combustion or venting, which makes them simpler to place. Both typically last 8 to 12 years^[1]. See gas tank water heaters and electric tank water heaters.

Tankless: on demand, limited by flow

Tankless units heat water as it passes through, so there is no stored hot water to lose heat. They are limited by flow, measured in gallons per minute at a given temperature rise. DOE advises sizing a tankless unit for the most flow you use at once and the biggest rise you need^[10]. A gas tankless often needs a larger gas line and new venting. A whole-house electric tankless can need a much larger electrical service.

Condensing gas tankless units add a second heat exchanger that pulls more heat from the exhaust. They vent through plastic pipe and need a condensate drain. ENERGY STAR gas tankless units must reach a UEF of at least 0.95^[3]. See tankless gas, tankless electric and condensing vs non-condensing tankless.

Myth check: gas tankless water heaters are not banned. Congress nullified DOE's 2024 gas tankless rule under the Congressional Review Act in May 2025 (Public Law 119-6), and DOE withdrew it^[8][9].

Heat pump water heaters

A heat pump water heater works like a refrigerator in reverse, pulling heat from the surrounding air into the tank. DOE says they can be two to three times more efficient than standard electric resistance heaters^[6]. ENERGY STAR sets the bar at a UEF of 3.30 for integrated units, and 2.20 for 120-volt plug-in and split models^[3].

They have conditions. DOE says the space must stay between 40 F and 90 F year-round and give at least 1,000 cubic feet of air around the unit^[6]. They cool the room, need a condensate drain and make some noise. DOE's 2024 standard will require heat-pump-level efficiency for electric tanks in the most common sizes made from May 6, 2029^[7][9]. See heat pump (hybrid) water heaters.

Solar, indirect and combi systems

Solar water heaters use roof collectors to preheat water, with gas or electric backup. ENERGY STAR solar units must reach a solar UEF of 3.00 with electric backup or 1.80 with gas backup, and carry at least a 10-year collector warranty^[3]. See solar water heaters.

Indirect water heaters store water in a tank heated by a coil from the home's boiler. Combi boilers heat both the house and the water from one appliance. Both make sense when a boiler is already in place. See indirect and combi boilers.

Small and special cases

• Point-of-use units serve one fixture far from the main heater. See point-of-use water heaters.
• Propane models work like natural gas units but need propane-specific settings. See propane water heaters.
• Power vent and direct vent tanks use a fan or a sealed vent so they can vent through a side wall instead of a chimney. See power vent and direct vent water heaters.
• Recirculating systems bring hot water to the tap faster by moving it through a loop. See recirculating systems.

Which type fits your home

Your situation	Usually the better fit
Gas service, tight budget, old tank failed today	Gas tank, same size and venting
No gas, enough space in a garage or basement	Heat pump water heater
No gas, small closet, small panel	Electric tank or a 120-volt heat pump model
Staying 10+ years, gas line and vent can be upgraded	Gas tankless
One or two people with low use	Tankless or a small high-efficiency tank
Home with a boiler	Indirect tank

For sizing, fuel choice and brands, continue to the buying guide. For the head-to-head, read tank vs tankless.

Every water heater type

• Gas tank water heaters
• Electric tank water heaters
• Tankless gas water heaters
• Tankless electric water heaters
• Condensing vs non-condensing tankless
• Heat pump (hybrid) water heaters
• Point-of-use water heaters
• Propane water heaters
• Solar water heaters
• Indirect and combi boilers
• Power vent and direct vent water heaters
• Recirculating systems

When to call a pro

• Switching types or fuels: gas lines, venting and new circuits are licensed work.
• Choosing between tankless and a heat pump unit: a licensed plumber can check gas line size, vent routes, panel capacity and room size.
• Any install that needs a permit, which in many cities includes a like-for-like swap.
• If you ever smell gas near a water heater, leave the building and call the gas utility or 911 from outside.