How Old Is Your Coast to Coast Water Heater?
Coast to Coast was a hardware store chain, and its store-brand water heaters were built by Rheem Manufacturing — so they use Rheem's date code: month, then year, in the first four digits after any letter prefix. Enter your serial in the free decoder above for an instant answer, or follow the guide below to read it yourself.
Where to Find the Serial Number
Check the rating plate on the side of the tank — a silver or white sticker, usually in the upper half, that lists the model number and serial number together. The date lives in the serial, not the model number. On older tanks the sticker can fade; a phone photo with the contrast bumped usually makes the digits readable.
How the Coast to Coast Serial Format Works
Rheem encodes the date as MMYY — month first, then year — in the first four digits after any letter prefix:
Worked example — R1102B20331:
R= plant code (ignore)11= November (month)02= 2002 (year)Band the remaining digits = production sequence- Result: manufactured in November 2002
Letter prefixes are plant codes. Serials often start with R, RH, RN, RHNG, or a single letter — none of these are part of the date. Skip them and read the first four digits you find.
Why Your Coast to Coast Water Heater's Age Matters
- Age is the headline. The chain closed in the late 1990s, so a working Coast to Coast tank is a 25+ year old tank on borrowed time. Knowing the exact date tells you how much risk you are carrying.
- Lifespan. Tank water heaters average 8–12 years of service. Past that, internal corrosion makes tank failure — and a flooded floor — far more likely.
- Home inspections. If you just bought an older home with a Coast to Coast tank, plan for replacement in the first year; it will be a flagged item on any inspection.
Sources
Brand ownership and serial format verified against the InterNACHI water heater dating chart and InspectApedia's Rheem age decoder.