Gas Water Heater Replacement Cost: 50-Gallon Tank, Itemized (2026 Baseline)
A leaking 50-gallon gas tank replaced like for like in a basement: removal, the new tank, connections and an expansion tank, itemized with crew hours.
Describe it
Every line, by trade
The water heater swap in the Clamp app: described in plain words, then the draft at $2,411 job cost, every line grouped by trade. Sample data.
The job at a glance
One build, fully itemized, with crew hours.
| Build | Job cost | Labor | Crew hours | Materials | Illustrative selling price |
|---|---|---|---|---|---|
| A. 50-gallon gas tank, same spot | $2,411 | $1,251 | 6 to 11 h | $1,095 | $3,134 to $4,822 |
Dump fees and other costs ($65) are the same in every build and included in the job cost. Materials include allowances. Illustrative selling price is the job cost at a 30% to 100% markup; your price depends on your own overhead and profit. Labor hours are a planning range and include setup, daily cleanup and material runs; they are never a charge to the customer. Permit and inspection fees are not included; requirements vary by jurisdiction.
The build in detail
A. 50-gallon gas tank, same spot: $2,411
The leaking tank is drained, disconnected and hauled away; a new 50-gallon atmospheric-vent gas tank is set in the same spot with a new gas flex and drip leg, vent connector, water connectors, shutoff valves and an expansion tank. Labor is $1,251 of the $2,411 job cost, or 51.9%. It is about 6 to 11 hours of work, including setup, daily cleanup and material runs.
Labor cost by trade
Labor only. Materials, allowances and dump fees are in the line items below. Hours are person-hours at typical production from Clamp’s labor hours catalog, as a range: a planning figure, not a schedule and not a charge to the customer.
| Trade | Hours | Labor cost | Low-Overhead×1.30 | Established×1.50 | Full-Service×2.00 |
|---|---|---|---|---|---|
| Plumbing | 5 to 10 h | $1,251 | $1,626 | $1,877 | $2,502 |
| Setup, cleanup and material runs | 1 to 2 h | in the prices | |||
| All labor | 6 to 11 h | $1,251 | $1,626 | $1,877 | $2,502 |
Every line item
Labor $1,251 + materials and allowances $1,095 + dump fees and other $65 = $2,411 direct job cost. Hours are person-hours at typical production, on labor rows only, and the direct-cost row adds about 15% for setup, daily cleanup and material runs; an allowance or material row names the labor line that installs it, and a subcontract row has none, because the sub’s price includes their own time. Some labor quantities include a difficulty factor, so they can exceed the measured area; each row’s derivation is in the downloadable data.
| Item | Qty | Unit | Hours | Labor | Material | Line cost |
|---|---|---|---|---|---|---|
| Plumbing | ||||||
| Expansion Tank AllowanceLabor on: Expansion Tank Service Labor | 1 | ea | $0 | $85 | $85 | |
| Expansion Tank Service Labor | 1 | ea | 1 to 2 h | $325 | $0 | $325 |
| Gas Line Install Labor | 4 | lf | under 1 h | $76 | $0 | $76 |
| Gas Line MaterialsLabor on: Gas Line Install Labor | 4 | lf | $0 | $34 | $34 | |
| Supply Pipe Materials | 6 | lf | $0 | $21 | $21 | |
| Shutoff Valve Install | 2 | ea | 1 to 3 h | $290 | $0 | $290 |
| Tank Water Heater AllowanceLabor on: Tank Water Heater Install | 1 | ea | $0 | $850 | $850 | |
| Water Heater Connection KitLabor on: Tank Water Heater Install | 1 | ea | $0 | $105 | $105 | |
| Tank Water Heater Install | 1 | ea | 2 to 6 h | $560 | $0 | $560 |
| Plumbing subtotal | 5 to 10 h | $2,346 | ||||
| Plumbing subtotal | 5 to 10 h | $2,346 | ||||
| Appliances | ||||||
| Appliance Haul-Away and Recycling | 1 | ea | $0 | $0 | $65 | |
| Appliances subtotal | $65 | |||||
| Appliances subtotal | $65 | |||||
| DIRECT JOB COST | 6 to 11 h | $2,411 | ||||
| DIRECT JOB COST | 6 to 11 h | $2,411 | ||||
Methodology & reproducibility
One reviewed snapshot for this build. The build is frozen from its own estimate run and priced by the published pricer.
Direct cost equals the sum of each row’s rounded quantity × (labor + material + other). Amounts are shown in whole dollars; every column adds to its total.
Scope selection, prose accuracy, arithmetic and provenance mapping reviewed; not independent market-rate verification.
- water-heater-gas-tank-50/v1: JSON, CSV, field dictionary
Questions
Why is the tank only part of the cost?
The tank allowance is the single largest line, but the swap also carries a plumber's half day, new shutoff valves, an expansion tank and the connection parts. A like-for-like swap stays modest because the gas line, vent and location are reused.
What can push this job higher?
A vent that no longer meets code for the new tank, a chimney that needs a liner, an undersized gas line, a power-vent or high-efficiency unit, or moving the tank. Each is its own line when it is found.
Is the markup on top of this?
Yes. Direct job cost is what the swap costs a contractor to perform. The markup table shows what it sells for at illustrative markups of 30% to 100%.
Sources & provenance
- 50-gallon gas tank, same spot reviewed snapshot Clamp Research