Tank capacity
Water Heater Replacement Cost by Size
Compare 30, 40, 50, 65, 75 and 80 gallon installed storage-tank ranges without using household count as the final sizing method.
Current 2026 national data places a 40-gallon water heater around $600–$3,000 installed and a 50-gallon model around $700–$3,100. The wider capacity table runs from roughly $500–$1,900 for 30 gallons to $1,200–$4,000 for 80 gallons; the first-hour rating and actual peak demand still decide suitability.
What changes the result?
A useful calculation starts with the physical scope and the written commercial terms. These are the factors to make explicit:
- Tank capacity and first-hour rating
- Fuel and venting
- Physical diameter and access
- Electrical or gas upgrades
- Drain pan, expansion and code work
Use one scope for every quote
Give each business the same information and ask it to resolve the same boundaries. That makes the totals more comparable and exposes work left as an allowance or exclusion.
- List the current model and capacity
- Record peak simultaneous hot-water uses
- Confirm removal, permit and utility work
- Compare the same warranty and installed scope
2026 installed cost by tank size
HomeGuide reports 30 gallons at $500–$1,900, 40 at $600–$3,000, 50 at $700–$3,100, 65 at $900–$3,400, 75 at $1,100–$3,600 and 80 at $1,200–$4,000 installed. These are market observations, not a size recommendation.
- 30 gallons: $500–$1,900
- 40 gallons: $600–$3,000
- 50 gallons: $700–$3,100
- 65 gallons: $900–$3,400
- 75 gallons: $1,100–$3,600
- 80 gallons: $1,200–$4,000
Capacity is not the same as hot-water delivery
Tank volume is only one input. First-hour rating describes how much hot water the unit can supply during a peak hour, while recovery depends on fuel, input and efficiency. Match the household's peak-use pattern to the exact model rather than choosing by gallons alone.
Make the installed scope comparable
Ask whether the price includes the unit, labor, removal, permit, pan, drain, expansion control, shutoffs, venting or circuit work, startup and warranty registration. A larger tank may also change clearances and access.
Questions people ask
How much does a 40-gallon water heater cost installed?
HomeGuide's 2026 national range is $600–$3,000 installed. Fuel, model, warranty, access and property upgrades determine the local quote.
How much does a 50-gallon water heater cost installed?
The current HomeGuide range is $700–$3,100 installed. Confirm that removal, permits and any vent or electrical work are included.
Is a 50-gallon tank always right for a family of four?
No. Household count is only a shortcut. Peak fixtures, first-hour rating, recovery and usage pattern should be checked against the exact model.
Does a larger tank require an expansion tank?
Expansion control depends on the plumbing system and local code, not capacity alone. Ask the installer to state whether it is required and whether it is included.
Method and sources
The model is a planning tool, not a quotation. These are the published sources used for this page; read the full assumptions before relying on a range. Source review: 14 September 2026.
- HomeGuide water-heater installation cost guide
January 2026 installed, equipment, capacity, labor, upgrade, repair and operating-cost observations; reviewed 14 September 2026.
- ENERGY STAR water-heater product criteria
Current UEF, first-hour-rating and certified-product criteria; reviewed 14 September 2026.