2026 cost guide
Tankless water heater cost: price the conversion, not just the box
Tankless equipment can cost more than a standard tank, but the bigger surprise is often the conversion work. Gas capacity, venting, condensate, electrical requirements, location, and flow-rate needs can all change the installed price.
Angi reports an average tankless cost of about $2,640 in 2026. This Old House publishes a broad installed range of roughly $1,200 to $3,500. More complex whole-home conversions can run higher. The useful comparison is not “tank versus tankless equipment price”; it is the finished job versus the finished job.
Why a tank-to-tankless conversion can cost more
When tankless is worth pricing
Tankless can be worth reopening when it solves a real problem: long-duration hot-water demand, space constraints, a planned remodel, or a strong preference for on-demand operation. If the current tank type and capacity already work well, a like-for-like tank replacement is usually the simpler comparison baseline.
Read the tank-versus-tankless decision guide.
How to ask for a tankless quote
- Ask for the exact model and rated capacity
- Ask what simultaneous hot-water demand the plumber is sizing for
- Separate equipment from conversion work when practical
- Identify gas, venting, electrical, condensate, recirculation, and location changes
- Compare warranty and service support
- Keep a like-for-like tank option on the table until the tankless benefit is clear
Sources checked September 2026: Angi tankless cost guide, This Old House tankless installation cost guide, and U.S. Department of Energy Building Science Education on gas tankless systems.
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