Water Heater Cost: Tank vs Tankless
A complete breakdown of every cost involved in buying and installing both types of water heater. Prices are 2026 US national averages - regional variation can be 20-50% higher or lower.
Tank Water Heater - Full Cost Breakdown
Typical total range
$700 - $2,200
| Item | Cost Range | Notes |
|---|---|---|
| 30-gallon tank unit | $400 - $700 | Adequate for 1-2 people |
| 40-gallon tank unit | $500 - $900 | Most common size, suits 2-3 people |
| 50-gallon tank unit | $600 - $1,100 | Family of 3-5 |
| 75-80 gallon tank unit | $800 - $1,500 | Large family or high demand |
| Standard installation | $250 - $400 | Like-for-like replacement, no upgrades |
| Complex installation | $400 - $700 | New location, expanded pipes, code upgrades |
| Expansion tank addition | $50 - $200 | Required by code in closed systems |
| Permit (where required) | $25 - $150 | Varies by municipality |
Tankless Water Heater - Full Cost Breakdown
Typical total range
$1,500 - $5,500
| Item | Cost Range | Notes |
|---|---|---|
| Electric tankless (small, under 10kW) | $150 - $400 | Point-of-use, single fixture |
| Electric tankless (whole home) | $500 - $1,500 | Requires significant electrical upgrade |
| Gas tankless (condensing) | $1,000 - $2,000 | High efficiency, best long-term value |
| Gas tankless (non-condensing) | $800 - $1,500 | Less efficient but lower upfront cost |
| Propane tankless unit | $800 - $2,000 | Good for homes without natural gas |
| Standard gas installation | $500 - $1,000 | New unit, existing gas and venting suitable |
| Complex gas installation | $1,000 - $2,000 | New venting, gas line upgrade needed |
| Electrical panel upgrade | $500 - $2,500 | For electric tankless - often required |
| Gas line upgrade (if needed) | $300 - $1,000 | If existing line is undersized |
| Permit | $50 - $300 | Typically required for new installations |
Factors That Affect Your Final Cost
Unit size and BTU rating
Larger units cost more. For tankless, higher GPM/BTU units can add $500-1,000 to the unit price.
Gas vs electric fuel type
Gas tankless units cost more upfront but run cheaper annually. Electric units may require costly panel upgrades.
Condensing vs non-condensing (gas tankless)
Condensing units (0.90+ EF) cost $200-500 more but recover more heat and cost less to operate.
Location of installation
Installing in a new location or outdoors adds $200-500. Outdoor units need freeze protection in cold climates.
Labor costs by region
Plumber rates range from $45-200/hour. High cost-of-living areas (NYC, San Francisco, Seattle) charge significantly more.
Hard water treatment
In hard water areas, a whole-house water softener ($800-2,500 installed) extends tankless lifespan significantly.