Tankless Water Heater
An on-demand water heater that heats water as it flows through a heat exchanger, eliminating the storage tank.
Quick answer
Tankless Water Heater: An on-demand water heater that heats water as it flows through a heat exchanger, eliminating the storage tank. Typical cost: $2,800–$5,500 installed (gas); $1,800–$3,500 (electric whole-house)..
Why it matters
Tankless units last 18–22 years, free up floor space, and cut standby losses — but installation can require gas-line and venting upgrades that double the price.
Typical cost
$2,800–$5,500 installed (gas); $1,800–$3,500 (electric whole-house).
Pros
- • Endless hot water
- • 20+ year lifespan
- • Smaller footprint
Cons
- • Gas upgrades may be required
- • Hard water can scale heat exchanger
- • Higher upfront cost
Common uses
- • Homes with constant hot-water demand
- • Small homes needing space
- • Long-term ownership
Alternatives
Conventional tankHeat-pump water heater
Learn
All plumbing answers
Browse
All entities
People also search for
More plumbing entities
Frequently asked questions
- Is tankless worth the cost?
- Yes if you'll own 10+ years and use moderate-to-high hot water; payback is otherwise too slow.
HomeownerAnswers.com
Search another homeowner question
Costs, repair vs replace, financing, insurance — get an answer in seconds.
Estimates and guidance are educational. Always confirm with a licensed local professional before making decisions.