Tankless water heater installation in Detroit
A tankless unit costs more to put in, lasts longer on the federal figures, and a conversion can mean new gas piping and new venting. Here is what each of those is published at, and the one caveat the federal guide prints.
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Typical cost: A tankless unit installed $1,400 – $3,900, labor alone $600 – $1,900 (Angi, national, updated July 2026); tankless repair $300 – $1,300 (HomeGuide, national)
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What the federal guide says
Longer life, and one caveat.
The life expectancy
More than 20 years, with easily replaceable parts that may extend it further, against 10–15 years for a storage tank (the federal energy office’s guide).
The same guide says a tankless unit avoids the standby heat loss a tank has, because it is not keeping a tank of water hot between showers (the guide).
The caveat
The same guide: a gas tankless unit can waste energy if it has a pilot light, and that can sometimes offset the standby losses it saved. In a gas storage heater the pilot light is heating the water in the tank, so the energy is not wasted; in a tankless unit it is not (the guide).
The guide’s own advice is to check the manufacturer’s literature for how much gas the pilot uses on the model you are quoted. Ask the contractor.
Published ranges
National figures with their sources. None is a quote and none is a Detroit price.
- Tankless unit installed
- $1,400 – $3,900
- Labor alone, tankless
- $600 – $1,900
- Tank replaced and installed, for comparison
- $882 – $1,826
- Labor alone, tank swap, for comparison
- $150 – $450
- Tankless repair
- $300 – $1,300
- Tankless maintenance
- $75 – $300
- Venting, replacing what is there
- $100 – $600
- Venting, new run
- $500 – $1,500
Installation and labor from Angi, national, updated July 2026; repair, maintenance and the venting lines from HomeGuide’s national pages (repair · installation). Every range with its source.
The Detroit part
The gas piping is its own permit line
A tankless conversion can mean a larger gas line and a different vent, and on Detroit’s fee schedule the gas piping is a mechanical line, not a plumbing one. The schedule lists a gas piping system permit at $127 each system, a preliminary inspection at $100 a visit, and, separately, a hot water tank at $117 (the city’s fee schedule).
Meanwhile the plumbing schedule lists a $73 application fee and $44 for a plumbing appliance (same schedule). No city page says which schedule a water heater is filed under, so the lines are not added together here. The whole fee picture, and who pulls what.
Ask whether the contractor holds the mechanical license as well as the plumbing one. The state permits them separately (plumbing · mechanical), and a tankless conversion touches both.
Money back, and the number it turns on
- DTE’s instant discount applies to a gas tankless unit rated 0.81 or better (the UEF, the federal efficiency measure for water heaters), taken off at the participating contractor or at the store (DTE). DTE publishes no dollar amount, and the funds are first come, first served.
- A loan program the state backs sets its gas tankless floor at 0.82, and its lenders publish rates as low as 6.24% to 6.99% on loans from $1,000 (the program · the eligible improvements list, updated April 2026).
- Michigan’s emergency relief is for a heater that has stopped working, not an upgrade: up to $1,500 in a lifetime for a homeowner who qualifies (the program). All of it in one place.
Descaling instead of flushing
A tankless unit has no tank to flush, so the maintenance is descaling instead, and Detroit’s water is the reason it matters: the water department’s 2025 mineral table puts tap water at 107 ppm hardness on average and 142 at its hardest (the 2025 report), which the federal water survey classes as moderately hard on average and hard at the peak (the survey). Published national cost of tankless maintenance: $75 – $300 (HomeGuide). Ask the contractor what interval the unit’s manufacturer specifies for hard water before you buy it.