The best water heater installer is licensed, pulls the permit, sizes the unit to your household, and gets the venting and pressure-relief right. A water heater is a gas-and-water appliance — done wrong it leaks, vents carbon monoxide, or fails inspection at resale. The cheapest cash-only swap is the one most likely to skip the permit and the safety checks that matter.
Here's how to vet a plumber, what tank and tankless installs cost, and when a repair beats a full replacement.
A licensed plumber pulls the permit and the inspection confirms the gas, venting, and relief valve are safe. A cash-only, no-permit swap can void insurance and fail when you sell the home.
A 40-gallon tank in a four-bath house runs out of hot water; an oversized unit wastes energy. A good plumber sizes by household and fixtures, not just by swapping like for like.
New installs often need an expansion tank, a drip pan, updated venting, or a sediment trap to meet current code. A real bid names these; a lowball ignores them until inspection.
You want the manufacturer's tank warranty plus the plumber's labor warranty in writing. Ask who handles a warranty claim two years from now — the answer tells you if they'll be around.
Real 2026 ranges, including the unit and labor:
For a deeper breakdown of the numbers, see our water heater installation cost guide.
A new heater isn't always the answer:
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A standard tank runs $1,200 to $2,500 installed. Tankless runs $3,000 to $6,000 because of gas and venting upgrades. Code work adds to it.
Tank is cheaper upfront and simpler. Tankless costs more to install but lasts longer and never runs out. Tankless pays off if you're staying in the home a while.
Most jurisdictions require one. A licensed plumber pulls it and the inspection confirms gas, venting, and relief are safe. Skipping it can void insurance.
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