Water Heater Installation Invoice Template — Free Download (2026)
Water heater invoices that just say "install water heater" create problems when the homeowner's energy bill doesn't drop as expected, when a warranty claim requires proof of the installed unit's specs, or when an inspector asks for permit documentation. A complete water heater invoice documents the unit manufacturer and model, tank capacity or flow rate (GPM for tankless), BTU input, first hour rating, Energy Factor or UEF rating, fuel type, venting method, permit status, and both equipment and labor warranty terms. This guide covers what to include on a water heater installation invoice for tank, tankless, and heat pump water heaters.
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Unit specs: manufacturer, model, capacity, BTU, and efficiency rating
'Water heater: Rheem Performance Platinum 50-gallon gas tank water heater, Model PROG50-38PF60, Natural Gas, 38,000 BTU input. First Hour Rating: 77 gallons. Uniform Energy Factor (UEF): 0.67. Energy Star certified. 12-year tank/parts/labor warranty (Rheem).' For tankless: 'Water heater: Rinnai RU199iN condensing tankless, Natural Gas, 199,000 BTU max input. Flow rate: 9.8 GPM at 35°F rise. Energy Factor: 0.96. Condensing unit — requires neutralizer for condensate drain. 12-year heat exchanger / 5-year parts / 1-year labor warranty (Rinnai).' The BTU input and first hour rating tell the homeowner whether the unit was sized correctly for their household. The UEF or Energy Factor matters for any efficiency rebate claims.
Fuel type, venting method, and gas line work
'Fuel: Natural Gas. Existing 3/4" gas line — no upsizing required. Shutoff valve at unit: new 1/4-turn ball valve installed. Venting: Category III direct vent, 4" PVC, existing B-vent liner removed and capped. New PVC termination through rim joist. CO detector: existing CO detector within 10 ft of unit — confirmed functional. For electric: Fuel: 240V electric. Existing 30-amp circuit confirmed adequate for 4,500W elements. New 10/2 wire from panel not required — existing wire meets code.' Tankless gas often requires a larger gas line than the existing tank unit — document whether you upsized: 'Gas line upsized from 3/4" to 1" per manufacturer 200,000 BTU requirement — see change order CO-001.' An undersized gas line on a tankless installation is the most common cause of poor performance — document the line size to show you addressed it.
Permit status and inspection
'Permit: City of Columbus Building Permit #2026-PLM-04419 pulled before installation. Final inspection: pending — scheduled June 18, 2026. Permit fee: $75 (included in contract). Note: permit is required by Ohio Plumbing Code for water heater replacement. Permit card left on unit until inspection passes — do not remove.' Or if no permit: 'Permit: homeowner declined permit per their written direction (on file). Contractor recommends permitting for warranty protection and code compliance. Contractor not responsible for code violations or warranty issues arising from unpermitted installation.' Permits on water heaters are required in most jurisdictions and protect both the homeowner and the plumber — document either way.
Supply connections, expansion tank, pressure, and code items
'Supply connections: new flexible braided stainless connectors (18") at hot and cold. Drip leg on gas supply: new drip leg installed at unit. Expansion tank: Watts ET-30 thermal expansion tank installed on cold supply — required by code when pressure reducing valve present. System pressure: 65 PSI measured at hose bib (within range). T&P relief valve: new T&P valve installed (required code item — original replaced regardless of age). Discharge pipe: copper drain routed to floor drain per code. Anode rod: factory-installed — checked, adequate.' These code items are the most common items inspectors look for. Documenting them on the invoice shows they were addressed and creates a record for the homeowner.
Haul-away of old unit and what's not included
'Haul-away: existing 40-gallon gas water heater removed and hauled to licensed recycling facility. Fuel-side: gas line capped and pressure tested before new unit connected. Not included: water damage remediation if existing unit leaked before replacement (visible water damage noted at [location] — remediation is owner responsibility). Drywall or framing repair. Softener salt or water quality treatment. Annual maintenance after installation (recommend flushing tank annually and checking anode rod every 3–5 years).' If the old unit leaked and there's visible water damage, document it before you haul it away — otherwise you may get blamed for damage that pre-dated your work.
Water heater installation invoice example
50-gallon natural gas tank replacement with permit
INVOICE #WH-2026-0052
Clearwater Plumbing | (614) 555-0133 | Customer: J. & K. Navarro | 5520 Birchwood Pl., Westerville, OH | Service: June 11, 2026 | Water heater replacement
| Item | Qty | Unit | Total |
|---|---|---|---|
| Rheem Performance Platinum 50-gal NG, Model PROG50-38PF60, 38,000 BTU, FHR 77 gal, UEF 0.67. Energy Star certified. 12-year warranty (tank/parts/labor). Serial #: RH2026061101. | 1 | unit @ $1,140 | $1,140 |
| Installation — remove existing 40-gal unit, install new 50-gal. New 18" braided SS flex connectors (hot/cold). New 1/4-turn ball valve on cold supply. Drip leg at gas stub-out. | 1 | LS @ $380 | $380 |
| Expansion tank — Watts ET-30 thermal expansion tank. Required: pressure reducing valve present (system pressure 68 PSI measured). Installed on cold supply above shutoff. | 1 | unit @ $185 | $185 |
| T&P relief valve — new T&P valve installed (Watts 210 series). Copper discharge pipe routed to floor drain per Ohio Plumbing Code. | 1 | unit @ $65 | $65 |
| Permit — City of Westerville Plumbing Permit #2026-PLM-01882. Permit card left on unit. Inspection scheduled June 18, 2026. | 1 | LS @ $85 | $85 |
| Haul-away — remove existing 40-gal Rheem (failed anode rod, 14 years old). Fuel-side gas capped and pressure tested before reconnection. Unit recycled. | 1 | LS @ $45 | $45 |
| Total due on completion | $1,900 | ||
5 invoicing rules for water heater installers
Always pull the permit — and document it on the invoice
Water heater replacement is a permitted work item in most US jurisdictions. Skipping the permit saves $50–$150 and creates liability for the homeowner and the plumber: the installation is unpermitted, the homeowner's homeowner insurance may not cover water damage from a failed unit that wasn't inspected, and future home sales may require disclosure. Put the permit number on the invoice. If the homeowner declines the permit, document it in writing — 'permit declined by owner, on file' — so you're not responsible for the consequence.
Document the expansion tank — and why it was required
Thermal expansion tanks are required when a backflow preventer, pressure reducing valve, or check valve is present on the supply — any of these create a 'closed system' that can't release the pressure from heated water expanding in the tank. Without an expansion tank in a closed system, the T&P valve cycles repeatedly and can fail prematurely. Document it: 'Expansion tank: required — PRV present, closed system. Watts ET-30 installed.' Some homeowners question the expansion tank as an upsell — the explanation is on the invoice, not in a follow-up call.
Install and document the T&P relief valve regardless of existing valve condition
The temperature and pressure relief valve is the last safety device between a hot water heater and a dangerous pressure failure. Code (and most manufacturers) require a new T&P valve on every installation — even if the existing one looks fine. Document it: 'T&P valve: new Watts 210 series installed. Discharge pipe: copper, routed to floor drain per code.' A T&P valve that fails years later and causes water damage is a liability question about what was installed and when. Your invoice answers it.
Note the reason the old unit failed — it affects warranty conversations
If the old water heater failed due to a failed anode rod (most common failure mode for tank units), sediment accumulation, a corroded fitting, or an electrical issue — document it on the invoice. 'Existing unit: Rheem 40-gal, 14 years old. Failure mode: depleted anode rod, tank corrosion. Unit at end of service life — no warranty on existing unit.' This context helps the homeowner understand why the unit needed replacement (vs. repair), and it creates a record if questions arise about why the old unit wasn't repaired instead.
Separate unit cost, installation, code items, and permit as individual line items
A lump-sum 'water heater installed: $1,900' invoice is harder to evaluate and creates questions about what was done. Separating the unit ($1,140), installation labor ($380), expansion tank ($185), T&P valve ($65), permit ($85), and haul-away ($45) lets the homeowner understand the full scope. It also makes warranty conversations cleaner — if the unit itself fails, the equipment warranty applies to the $1,140 line. If there's an installation issue, the labor warranty applies to the $380 line. Lump-sum pricing collapses that distinction.
Frequently asked questions
How much does water heater installation cost in 2026?↓
Tank water heater (40–50 gal gas), supply and install: $1,200–$2,200. Tank water heater (40–50 gal electric), supply and install: $900–$1,600. Tankless condensing gas (whole-house), supply and install: $2,500–$5,500. Heat pump water heater (50 gal), supply and install: $1,800–$3,500. Key add-ons: expansion tank ($150–$250), permit ($50–$150), gas line upgrade ($200–$600 if undersized), venting modifications ($150–$500), haul-away ($40–$75). Labor-only (homeowner supplies unit): $250–$600 for standard replacement.
Tank vs. tankless vs. heat pump — which is right for my home?↓
Tank (conventional): lowest upfront cost, simplest installation, reliable. Runs out of hot water if demand exceeds tank capacity. Gas: 8–12 year lifespan. Tankless (on-demand): heats water only when needed — no standby heat loss. Higher upfront cost. Condensing models (96%+ efficiency) may need a neutralizer for acidic condensate. May require gas line upsizing. Best for high-demand households or vacation homes with long idle periods. Heat pump (hybrid): most efficient electric option — uses heat pump technology to pull heat from surrounding air. Requires 700–1,000 CF of surrounding air space. Substantial energy savings vs. standard electric. May qualify for federal tax credit (up to $600 in 2026 under Section 25C). Best for homes with electric heat and space in a conditioned basement or utility room.
Do I need an expansion tank on my water heater?↓
Yes, if any of the following are present: a pressure reducing valve (PRV) on the main supply, a backflow preventer, or a check valve on the water meter. These create a 'closed system' — heated water expands and has nowhere to go, causing pressure cycling and premature T&P valve wear. An expansion tank absorbs the pressure from expansion. Cost: $150–$250 installed. If a plumber doesn't mention an expansion tank and you have a PRV, ask — it's a code requirement in most jurisdictions and a safety item.
How long does water heater installation take?↓
Standard tank replacement (same location, same fuel type): 2–3 hours including haul-away and permit paperwork. Adding an expansion tank: +30–60 minutes. Tankless installation (existing gas and venting): 3–5 hours. New tankless with gas line upgrade and venting modification: 5–8 hours. Heat pump water heater: 3–5 hours if electrical is adequate. Moving the water heater location or converting fuel type (gas to electric or vice versa) is a larger project: estimate 6–12 hours plus permit and inspection time.
When should I replace vs. repair my water heater?↓
General rule: if a tank water heater is 8+ years old and fails, replace it — repair costs are rarely worth it near end of service life. Under 8 years old: repair if the failed component is a heating element (electric), thermocouple (gas), or thermostat — these are $20–$100 parts. Replace if the tank itself is leaking or corroded — no repair for a leaking tank. Tankless: these units are repairable — individual components (heat exchanger, flow sensors, igniter) can be replaced. Repair is usually cost-effective if the unit is under 10 years old and under $400 repair cost.
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