Start with the problem the next unit must solve
Collect the current model and capacity, installation location, photos of accessible connections, household occupancy pattern, and any recurring hot-water shortfall. Avoid measuring near hot or energized parts.
Write down why replacement is being discussed: a confirmed leaking tank, unavailable repair part, repeated documented failure, insufficient usable hot water, a remodeling change, or another verified condition. Include the current model, capacity, energy type, installation history, and how the household uses hot water at busy times. List showers, tubs, appliances, simultaneous use, and any recent occupancy change. Do not choose capacity from the old label alone, because the old installation may not match present demand. Ask the provider to explain the sizing assumptions and the expected performance under those conditions. A recommendation should distinguish a failed unit from a system that simply no longer suits the household. That distinction affects whether replacement alone solves the complaint or whether distribution, mixing, fixtures, or utility capacity also need attention.
Compare demand, utilities, access, venting, and drainage
- fuel or energy type
- usable space and removal route
- current vent, drain pan, discharge, and nearby floor drain
Compare installed scope line by line
Request comparable written scopes. Each should identify the unit, included connections, code updates, permit responsibility, haul-away, startup, testing, warranty, and exclusions.
Two estimates for the same tank can differ in removal, disposal, delivery access, pipe changes, valves, electrical or gas work, venting, drainage, relief discharge, supports, and code-related corrections. Request the exact equipment model and a written description of everything needed to put it into safe operation. Ask what existing conditions were inspected and which assumptions may change after removal. If a different fuel type or tankless system is proposed, utilities and vent routes may substantially change the project. Permit or registration responsibility, inspection scheduling, protection of finished areas, cleanup, startup, and warranty registration belong in the scope. A low equipment price is not a complete installed price. Resolve exclusions before accepting the work, especially when another trade is expected to provide power, gas, carpentry, drainage, or restoration.
Ask whether the quoted equipment is available in the stated model and what happens if a substitution is proposed. Capacity, dimensions, venting, connection locations, efficiency features, and warranty can change with the substitute. Require the revised model and any installation differences in writing before it is installed, rather than accepting a different unit simply because the original has already been removed.
Product selection cannot approve the installation
Equipment selection and installation need qualified evaluation. This page does not size a heater, approve a vent, or determine code compliance.
Finish with an operating and approval record
Before the old unit leaves, photograph its label and any relevant failure evidence for the property record. For the new unit, keep the model, serial information, manufacturer instructions, invoice, permit or registration, inspection result, startup record, and warranty terms. Ask the provider to explain the normal controls, safe shutdown information, maintenance requirements, and signs that call for a separate utility or emergency response. Final testing should observe connections for leakage and check delivered hot water under the agreed demand conditions. Do not operate safety valves, adjust gas components, or remove electrical covers as a homeowner demonstration. If an inspection remains open or a trade has unfinished work, record that explicitly rather than treating payment as completion. Any wet building material from the old failure still needs its own drying and restoration decision.
- Why is this size and type recommended?
- Which existing conditions require changes?
- Who obtains approval and schedules inspection?