Cost GuidesWater heater replacement
When a water heater is worth replacing, how tank and tankless compare, and the installation factors that change a quote.
By Elijah Canfield, Founder, Hire Best Pros · Updated August 27, 2026
Elijah Canfield is the founder of Hire Best Pros. He writes and edits the site's consumer guides, with a focus on how home service and moving projects are priced, scoped and compared.
Replace rather than repair when the tank itself is leaking, when the unit is near the end of its service life, or when a repair approaches a large share of replacement cost. Price is driven by fuel type, capacity, whether you switch between tank and tankless, venting, gas line or electrical work, and code upgrades such as expansion tanks and pans.
Key points
- Water on the floor from the tank body is a replacement, not a repair.
- Switching to tankless is a plumbing and venting project, not a swap.
- Permits and code upgrades are part of a real quote, not an extra.
Signs it is time
- Rusty or discolored hot water
- Rumbling or popping from sediment in the tank
- Hot water that runs out much sooner than it used to
- Moisture, corrosion or pooling at the base of the tank
Tank and tankless compared
A tank heater stores hot water and is usually the cheapest like for like replacement. A tankless unit heats on demand, takes less space and can last longer, but often requires larger gas supply, new venting and sometimes electrical work, which is where the cost difference lands.
Costs vary based on location, project size, materials, complexity, access and the provider you hire.
What belongs in the quote
- Removal and disposal of the old unit
- Permit and inspection where required locally
- Expansion tank, drain pan, seismic strapping or pressure valve if code requires it
- Venting, gas line or electrical modifications
- Labor warranty separate from the manufacturer warranty
Get water heater quotes
Find a plumberCommon questions
- How long does a water heater last?
- Service life depends on the type of unit, water chemistry and whether it has been flushed regularly. A plumber can assess the specific unit rather than guessing from age alone, and hard water shortens the life of any tank.
- Can I install one myself?
- Many jurisdictions require a permit and inspection, and gas and venting work carries real safety risk. Even where self installation is legal, an improperly vented or unsupported unit can void insurance and endanger the household.