How much does a new water heater cost in Boise?

National cost guides, read November 6, 2026, put a standard 40 to 50 gallon tank at $600–$3,100 installed, a tankless unit at $1,400–$5,600 and a heat pump water heater at $2,000–$4,600. Inside Boise, the City plumbing permit for a single appliance is $55 under its published fee schedule.

Do I need a permit to replace a water heater in Boise?

Yes. The City of Boise lists installing or replacing a water heater as work that needs a plumbing permit. A licensed plumbing contractor pulls it as part of the job; a homeowner can pull one for their own primary residence if they do the work themselves.

Should I repair or replace?

Age decides most cases. A standard tank lasts about 8 to 12 years. A younger tank with a failed element, thermostat or valve is usually worth a repair ($150–$700 nationally). Water coming from the tank body itself means the tank has failed and cannot be repaired.

Is tankless worth it?

It costs more up front ($1,400–$5,600 installed nationally) and lasts longer, about 15 to 20 years. In Boise the catch is usually the gas line: the City's installation guide notes a typical tankless unit is around 180,000 BTU against about 40,000 for a 50-gallon tank, which normally needs a larger gas line.

Water heaters · Boise, Idaho

Water Heater Repair and Replacement in Boise

A leaking or dead water heater in Boise comes down to three questions: repair or replace, tank or tankless, and who pulls the City permit. National guides put a standard tank at $600–$3,100 installed and most repairs at $150–$700 (read November 6, 2026); the City of Boise requires a plumbing permit for the replacement. Boise Elite Plumber matches you with an independent local plumber who quotes the job.

Published November 10, 2026 · Figures and rules checked against the sources listed at the end of this page.

If it is leaking right now

Close the cold-water valve on top of the heater If it will not close or the leak continues, close the main shutoff.
Cut the energy Gas: turn the control to off. Electric: switch off the breaker. Do not touch electrics while standing in water.
Find where the water is coming from A fitting or valve on top can be repaired. Water from the tank body means replacement.

Repair or replace

Repair when the tank is well inside its 8 to 12 year life and the fault is a part: a heating element or thermostat ($100–$350), a thermocouple ($100–$325), a gas control valve ($150–$550) or a relief valve ($50–$300).
Replace when the tank itself leaks, when rust shows in the hot water, or when an old unit needs a repair that costs a large share of a new one.
Maintain in between: a flush runs $75–$250 and an anode rod $150–$350 nationally.

What replacement costs

Installed water heater costs, national ranges (read November 6, 2026)
Type	Installed
30-gallon tank	$500–$1,900
40-gallon tank	$600–$3,000
50-gallon tank	$700–$3,100
65-gallon tank	$900–$3,400
75-gallon tank	$1,100–$3,600
Tankless	$1,400–$5,600
Heat pump	$2,000–$4,600
City of Boise plumbing permit (single appliance)	$55

What Boise's inspector looks for

The City's Water Heater Installation Guide (June 2025) is the checklist. A quote that ignores these is not a complete quote:

A drain pan on any floor other than concrete, piped to a drain, the garage floor or outside.
An expansion tank if the home has a pressure-reducing valve or a check valve on the cold side.
A relief-valve drain line piped full size, pointing down, never capped, and not into the pan.
In a garage, the burner or lowest element at least 18 inches above the floor.
A gas shutoff within six feet, and a gas line sized for the new unit's BTU rating.

Gas piping changes are permitted separately, under a mechanical permit. Full detail: Boise plumbing permits.

Questions to ask the plumber

What is your Idaho plumbing contractor certificate number? (How to look it up.)
Is the permit on the quote as its own line, and who books the inspection?
Does the price include the pan, expansion tank, new flex connectors and haul-away?
If going tankless: does the gas line need upsizing, and is that in the price?

Sources and dates

Every figure and rule above names where it came from and the date it was read. If a source disagrees with a quote you receive, the quote wins: it reflects your house, your pipes and this week's demand. Prices are rechecked at least every six months.

HomeGuide, "How Much Does Water Heater Installation or Replacement Cost? (2026)" — read November 6, 2026. Installed cost by type and size; lifespans. National.
HomeGuide, "How Much Does Water Heater Repair Cost? (2026)" — read November 6, 2026. Repair cost by part. National.
City of Boise Building Division, "Homeowner’s Guide to Residential Construction" — read November 10, 2026. Water heater installation or replacement needs a plumbing permit.
City of Boise Building Division, "Water Heater Installation Guide" #420-A (6/2025) — read November 10, 2026. Inspection points: drain pan, expansion tank, relief-valve drain, garage height, gas sizing, CO alarm.
City of Boise, "Boise City Plumbing Code Fee Schedule" (PDF, dated Oct. 2021) — read November 10, 2026. Permit fee for a single appliance. PDF dated October 2021.