| What it does | Find how old a water heater, furnace or air conditioner is from its serial number
| Free online stopwatch, countdown timers, and time management tools for classrooms, workouts, and everyday use
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| Stage | Not given
| Startup
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| Founded | Not given
| 2024
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| Based in | Not given
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| Pricing model | Free
| Free
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| Pricing | Not given
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| 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
| - Stopwatch with lap times and split recording
- Countdown timer with audio alerts
- Interval timer for HIIT training
- Fullscreen display for projectors and classrooms
- Keyboard shortcuts for hands-free control
- Multiple simultaneous timers in browser tabs
- Offline functionality after initial load
- Visual timer with color-change warning system
- Exam timer with fullscreen high-contrast mode
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| 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
| - 50+ free timer tools with no download, login, or paywall required
- Privacy-first design with no data collection for unregistered users
- Mobile-first design optimized for phones and tablets in real-world conditions
- Millisecond-level accuracy using browser Performance API
- WCAG 2.1 AA accessibility compliance with sensory-friendly options
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 1 ● no change since last check | 33 ● no change since last check |
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| Trust Flow (Majestic) | 1 | 15 |
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| Citation Flow (Majestic) | 17 | 29 |
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| Referring domains (Majestic) | 4 | 77 |
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Age by Serial Number
Stopwatch.now