Quick answer
A water heater swap is a same-day job when the decisions are made before the truck arrives: size and fuel, code upgrades (expansion tank, pan, valves), placement, and permit. This checklist walks the decisions in order, so an emergency replacement doesn't turn into a week of cold showers.
- Decide size/fuel/type BEFORE failure — tape this list to the tank at year eight.
- Expect code items: expansion tank, drain pan, and proper T&P discharge are standard now.
- A permit isn't optional in MD/DC/VA jurisdictions — a company that skips it is cutting corners.
When should you run this list?
Ideally at year 8–10 of the current tank's life, while everything is calm. Realistically, many homeowners run it the morning a tank fails — it works then too, in about ten minutes on the phone.
The checklist
- 01° Confirm fuel type (gas, electric, or considering hybrid) and whether you're staying like-for-like or upgrading.
- 02° Pick capacity from real usage — household size, simultaneous showers, soaking tub — not just the old tank's label.
- 03° Ask what current code requires in your jurisdiction: expansion tank, drain pan with drain line, seismic strapping where applicable, T&P discharge piping.
- 04° Confirm the permit is included and who schedules the inspection.
- 05° Check access: can the old tank actually come out (stairs, doorways, finished basement)?
- 06° Decide placement — same spot, or is this the moment to reclaim the closet with a tankless/wall unit?
- 07° Ask for the full written scope: haul-away of the old unit, new shutoff valve, flex connectors, and warranty terms (tank AND labor).
- 08° If gas: confirm the installer is licensed for gas fitting (Tario's MD license covers PLB & GFC — plumbing and gas).
- 09° Plan the money: get the total in writing, and ask about financing if it's an upgrade (Tario offers Wells Fargo financing with approved credit).
- 10° After install: note the install date and set a reminder for the year-4 anode check.
The corner-cut install
No permit, no expansion tank, reused corroded shutoff valve — it's faster and cheaper that day, and it fails inspection whenever the house sells. Insist on the code items; they exist because of real failures.
The panic oversize
Buying the biggest tank on the truck after a cold shower costs more forever (standby losses) without fixing the real issue if the old unit was mis-sized or sediment-choked. Ten minutes of sizing math beats it.
Proof, process & local validation
- Tario replaces water heaters across MD, DC & Northern Virginia with licensed plumbing and gas work (MD PLB & GFC #92636).
- 24/7 availability at (410) 314-1161 — most failed tanks are replaced same-day.
- 100% satisfaction guarantee, family-owned since 2013, 4.9-rated on Google.
Methodology: Checklist mirrors Tario's replacement workflow and the code requirements of the Maryland, DC, and Virginia jurisdictions it's licensed in. Last updated: 2026-07-02
Common questions
How long does a replacement take?
A like-for-like tank swap is typically 2–4 hours once on site. Tankless conversions run longer because of venting and gas-line work — usually a full day.
Why do I suddenly need an expansion tank?
Modern code requires one on closed systems (homes with backflow prevention or a PRV) to absorb thermal expansion. Your old install predates the requirement; the new one can't.
Can you replace it the same day the old one fails?
Usually yes for standard tank sizes — call (410) 314-1161 early in the day and we'll confirm availability and get the water off safely in the meantime.