A water heater replacement is the most-shopped job in plumbing. The homeowner has no hot water, three tabs open, and a number in their head from a big-box website that doesn’t include half of what the job actually takes. Your estimate has to close that gap fast — here’s what goes into it.
What the price is actually made of
The unit
A standard 40- or 50-gallon gas tank is the baseline. What moves the number: capacity, warranty length (6-year vs. 10-12 year), power vent vs. atmospheric, and brand tier. Quote the exact model — “50-gal gas, 10-year warranty” reads like a professional chose it; “water heater” reads like a guess.
Labor that isn’t obvious to the customer
- Drain, disconnect, and remove the old unit (heavier than any homeowner expects)
- Set, level, and connect the new one — water, gas, venting
- Leak-test the gas line and check draft
- Fill, purge air, verify operation and temperature
The code items that surprise people
This is where cheap quotes fall apart. Depending on your jurisdiction and what the old install looked like, the job may also need: a new T&P discharge line, expansion tank, drain pan with a routed drain, seismic straps, a sediment trap on the gas line, updated venting, or a raised platform in a garage. Itemize these. When your quote is $400 over the guy who ignored them, the line items are your defense — and the inspector is your backup.
Haul-off, permit, and the small stuff
Disposal fees are real, permits are real (and often specifically required for water heaters), and flex connectors, valves, and fittings add up. A line that says “permit & inspection included” is worth more than its price — it tells the homeowner you’re doing it right.
Tank vs. tankless: sell it as options, not an argument
The homeowner googling “tankless worth it?” doesn’t want a lecture — they want to see both numbers side by side. Present it as a good/better/best choice:
| Option | What it is | The honest pitch |
|---|---|---|
| Good | Like-for-like tank, 6-yr warranty | Hot water back today, lowest cost |
| Better | Premium tank, 10–12-yr warranty, expansion tank | Same footprint, decade of peace |
| Best | Tankless with required gas/vent upgrades priced in | Endless hot water, wall space back — priced honestly, upgrades included |
The trap to avoid: quoting tankless without the gas line upsizing and venting it usually needs. That lowball wins the signature and loses the profit. Price the real job.
Speed wins this job more than price does
No-hot-water customers hire whoever makes the problem feel handled first. The plumber who sends an itemized, signable quote from the garage — deposit button included — beats the one who “will email something tonight.” That’s a workflow problem more than a pricing problem, and it’s fixable: see how a plumbing-specific estimate tool handles it, water heater presets included.
The one-paragraph summary
Quote the exact unit. Itemize the labor. Call out the code items by name. Include haul-off and the permit. Offer tank and tankless as clean options. Send it before you leave the driveway with a way to sign and pay a deposit. Do all that and you’re no longer competing with a big-box installer’s teaser price — you’re the company that clearly knows what the job takes.