Age by Serial Number vs Graph Paper Online

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Age by Serial Number compared with Graph Paper Online
Detail	Age by Serial Number	Graph Paper Online
What it does	Find how old a water heater, furnace or air conditioner is from its serial number	Free printable graph paper that prints at true size
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Free	Free
Pricing	Not given	Not given
Key features	Water heater serial number decoders for Bradford White, A.O. Smith, State, American, Whirlpool, Rheem, Ruud, Lochinvar Furnace and air conditioner decoders for Goodman, Amana, Lennox, Carrier, Trane, American Standard Water heater and furnace error code lookups Water heater sizing calculator for tank and tankless models Rheem water heater status light meanings Goodman furnace LED flash code reference Rinnai V53De tankless water heater code lookup Rheem tankless water heater code lookup	Customizable grid sizes from 2 mm to 50 mm Multiple paper sizes: Letter, A4, A5, A3, Legal and Tabloid Live preview with real-time updates Adjustable line color and weight Download up to 50 pages in one PDF Size check ruler on each sheet for verification Paper types including coordinate planes, polar grids, isometric, dot grid and music staff Optional name and date line for students Browser-based with no installation required PNG and SVG export options for Word and Canva
What makes it different	Independent reference not affiliated with or endorsed by any manufacturer Distinguishes manufacture date from installation date and emphasizes condition and maintenance over age Covers safety guidance including gas smell warnings and professional contractor recommendations	Draws every sheet from real measurements ensuring squares print at true size No watermark, no sign-up, no email gate required Settings automatically saved and shareable via URL Supported by advertising kept away from preview and print buttons
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	1 no change since last check	7 +7 (up) since last check
Trust Flow (Majestic)	1	0
Citation Flow (Majestic)	17	8
Referring domains (Majestic)	4	3

4 details filled in for both companies.

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