InstaBidsis tankless water heater worth it
A tankless water heater can help, with conditions, according to a U.S. Department of Energy Building America fact sheet from 2009, read in 2026: “It is true that they can be beneficial, but here are some points to be aware of”. It lists a minimum water flow before the unit fires, and gas units stop in power outages.
Source: U.S. Department of Energy Building America fact sheet, read 9 November 2026. Updated 2026-11-09
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Weigh the stored-water difference against the points to check
The Building America fact sheet describes a tankless unit as heating water as it flows, with no stored reservoir, so standby losses are eliminated. It adds that the unit does not deliver hot water to the faucet any quicker; for the most part, the wait depends on the plumbing design. (Fact sheet dated 2009, read 2026-11-09, U.S. Department of Energy Building America.)
Source: U.S. Department of Energy Building America fact sheet, read 9 November 2026.
What else do homeowners ask about tankless water heater?
What are the benefits of a tankless water heater?
The fact sheet lists the end of standby losses, because no reservoir of hot water is stored. It also describes tankless units as less subject to corrosion and, since they are not under pressure, less susceptible to leakage than tank-type heaters. (Fact sheet dated 2009, read 2026-11-09, U.S. Department of Energy Building America.)
Source: U.S. Department of Energy Building America fact sheet, read 9 November 2026.
What is a tankless water heater?
The fact sheet describes a compact heating unit that heats water as it is needed instead of storing it. When a hot water tap opens, a sensor detects the flow and a gas heating device raises the water to a preset temperature. (Fact sheet dated 2009, read 2026-11-09, U.S. Department of Energy Building America.)
Source: U.S. Department of Energy Building America fact sheet, read 9 November 2026.
How to choose a tankless water heater?
The fact sheet compares fuel types: gas tankless heaters generally have larger capacities than electric ones, and it does not recommend electric tankless systems because of low heating capacity and the higher-capacity electrical panel they require. For location, it advises a spot central to the faucets but on an exterior wall, to keep the vent pipe short. (Fact sheet dated 2009, read 2026-11-09, U.S. Department of Energy Building America.)
Source: U.S. Department of Energy Building America fact sheet, read 9 November 2026.
Record the conditions in your home
The fact sheet names three conditions to check. A tankless unit needs a minimum water flow before it fires, and low-flow fixtures or aerators may not reach it. Water with a high mineral content at higher temperature settings is likely to scale the heat exchanger, which then needs flushing with a descaling solution. A gas unit typically needs an electric connection, so it will not run during a power outage. (Fact sheet dated 2009, read 2026-11-09, U.S. Department of Energy Building America.)
Source: U.S. Department of Energy Building America fact sheet, read 9 November 2026.
Before requesting work, list the fixtures that draw hot water, any low-flow aerators, whether your water leaves mineral deposits, how often the power goes out, and where a vent pipe could exit an outside wall. Ask each contractor to state the minimum flow of the proposed unit, the descaling steps it needs, and how the vent will be routed, and keep those answers in the written scope.
Same job: the related lifespan guide
Sources for this decision
- U.S. Department of Energy, Building America fact sheet: Tankless Water Heaters, read 9 November 2026. Government guidance; attributed excerpts.