| What it does | Find how old a water heater, furnace or air conditioner is from its serial number
| Free AI BaZi calculator with astronomical precision and plain-English life readings
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| Stage | Not given
| Startup
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| Founded | Not given
| 2026
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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
| - Four Pillars natal chart calculation with True Solar Time calibration
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- 10-Year Da Yun luck cycle forecasting
- 78-pair Synastry matrix for relationship compatibility
- Daily Tong Shu Almanac with auspicious activities and taboos
- Birth-time rectification engine for unknown birth hours
- AI prompts for ChatGPT and Claude interpretation
- Zi Wei Dou Shu (Purple Star Astrology) cross-verification
- Deterministic solar-longitude ephemeris from 1900 to 2100
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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
| - Astronomical precision using True Solar Time and Equation of Time, not standard clock time
- Zero birth-data monetization and privacy-first browser-based computation
- 100% free with no signup, paywall or feature locks
- 24-hour human response SLA for technical and archival inquiries
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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 | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 1 | 0 |
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| Citation Flow (Majestic) | 17 | 12 |
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| Referring domains (Majestic) | 4 | 3 |
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Age by Serial Number
BaziTools