Research-backed, locally grounded guides for Treasure Valley, Idaho.
May 2026
A standard 40–50 gallon tank water heater replacement in Boise typically costs $1,200 to $2,500 installed by a licensed plumber, including the unit, labor, permit, and basic code upgrades. A tankless gas unit usually runs $3,500 to $6,500 installed because of additional venting, gas line, and electrical work. Heat pump water heaters fall between those ranges at roughly $2,500 to $4,500. The biggest cost drivers are fuel type, capacity, code upgrades, and the condition of your existing plumbing.
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