How our water heater estimates are calculated
A water heater quote is mostly three things: the unit, a few hours of labor, and whatever your installation needs to pass code today that it didn't need when the old unit went in. Our estimator starts from the installed cost of a like-for-like swap and adjusts for the type of unit and the capacity your household needs.
Household size and capacity
Capacity is the first thing a plumber will ask about. Undersized means cold showers; oversized means paying to keep water hot that nobody uses.
- 1–2 people: 30–40 gallon tank, or a 5–6 GPM tankless unit.
- 3–4 people: 40–50 gallon tank, or a 7–8 GPM tankless unit.
- 5+ people: 50–80 gallon tank, or a 9+ GPM tankless unit (sometimes two).
The code catch-up problem
This is the line item that surprises people. If your old heater went in fifteen years ago, local code has probably changed since. Expansion tanks, drain pans, seismic strapping, updated venting, and a proper shut-off valve are commonly required at replacement time and can add $200 to $800 to an otherwise simple swap. It isn't padding — but it should be itemized, not buried.
Switching type costs real money
Replacing gas-with-gas or electric-with-electric is the cheap path. Switching — tank to tankless, gas to heat pump — means new venting, gas-line sizing, or a dedicated circuit, and that's where quotes jump by $1,000 to $2,500.
The 10-year rule
Tank water heaters last 8–12 years. If yours is past 10 and needs anything beyond a thermostat or an element, put the repair money toward replacement — a leaking tank is not repairable, and it rarely gives much warning before it lets go.