Gas tankless water heater replacement cost in Phoenix, AZ
Installed, About 180,000–199,000 BTU (2–3+ bathrooms)
A typical tankless water heater (About 180,000–199,000 BTU (2–3+ bathrooms)) costs about $2,800 installed in the Phoenix area, about the same as the national figure, because plumbers here earn a median $31 an hour against $31 nationally.
Prices by size in Phoenix
| Size | Low | Typical | High | National typical |
|---|---|---|---|---|
| About 150,000 BTU (1–2 bathrooms) | $2,050 | $2,650 | $3,550 | $2,650 |
| About 180,000–199,000 BTU (2–3+ bathrooms) | $2,600 | $2,800 | $3,900 | $2,800 |
Local labor: what plumbers earn here
| Hourly wage | Phoenix metro | United States |
|---|---|---|
| 25th percentile | $26 | $24 |
| Median | $31 | $31 |
| 75th percentile | $44 | $41 |
The Phoenix market
Phoenix's Planning and Development Department is unusually permissive about replacements. Its residential permit page lists water heater replacements done by a licensed contractor among projects that do not need a permit, while a DIY electric water heater replacement does. The page does not address DIY gas replacements. Air conditioner repairs or replacements that do not increase size and capacity or change location also need no permit. Furnaces and heat pumps are not addressed, and no fee was found for the DIY permit. The flip side: with no permit, no city inspector checks the work, so the contractor's license is your main protection. Cooling defines the market here, with EIA finding 94% of Arizona homes use air conditioning and a quarter heat with a heat pump. Mesa, Chandler, Scottsdale and other valley cities set their own rules.
A tankless conversion that adds a new vent, a larger gas line or a new circuit is more than a swap, so ask the city whether it still counts as a replacement. Scale buildup is a common reason tankless units need service, so ask how the installer plans for descaling access and whether the quote includes isolation valves. Ask too where the vent will exit and whether the gas meter can carry the burner.
Permits in Phoenix
| Permit for this job | No when replaced by a licensed contractor; yes for DIY electric water heater replacement (source) |
|---|---|
| Fee | Unclear (none needed for the exempt contractor replacements; no fee figure found for DIY electric water heater permit) |
| Who can pull it | Unclear (exemption hinges on use of a licensed contractor; applicant eligibility for DIY permit not stated) |
| Inspection | Yes when a permit is required (generic); none for exempt replacements |
Rebates in Arizona
HEAR: status unclear. HOMES: status unclear. Source: Arizona Governor's Office of Resiliency (energy programs), checked October 13, 2026.
What these programs cover, and other states
Other systems in Phoenix
- Gas tank water heater
- Gas furnace
- Central air conditioner
- Heat pump (ducted, outdoor unit + air handler)
Gas tankless water heater cost in other metros
Sources
- City of Phoenix: Residential permits
- Arizona Governor's Office of Resiliency
- EIA, 2020 RECS: Highlights for space heating in U.S. homes by state
- EIA, 2020 RECS: Highlights for water heating in U.S. homes by state
- EIA, 2020 RECS: Highlights for air conditioning in U.S. homes by state
- https://pddonline-test.phoenix.gov/Permits/Instructions/35
- BLS OEWS May 2025, Phoenix-Mesa-Chandler, AZ (47-2152 plumbers)
- DOE Gas-fired Instantaneous Water Heaters Final Rule TSD (Dec 2024), Table 8.2.6 (2023$)