HTML Architecture Sitemap & Index Highway

Master Hub & Triage Center

1 Route

Central Hub /

Master Plumbing Diagnostic Triage & Sizing Utility Engine

Central interactive diagnostic triage hub routing users to verified sizing tools and emergency plumbing decoders.

Core Engineering Calculators & Diagnostics

4 Routes

Thermal Engine /water-heater-cost-calculator

Tankless vs Tank Water Heater Cost Calculator & Sizing Engine

Calculate continuous GPM demand, required temperature rise ΔT, and 10-year fuel cost comparison across 4 energy models.

Hydraulics /drain-slope-clog-calculator

Drain Pipe Pitch Calculator & Clog Remediation Chemical Safety Engine

Compute exact vertical drop in inches and slope percentage under IPC Table 704.1. Audit chemical drain cleaner safety against PVC traps.

Stem Matcher /shower-valve-identifier

Shower Valve Stem Identification Guide & Faucet Cartridge Diagnostic Engine

Identify unknown shower stems behind bathroom tile by broach spline tooth count, length, and handle rotation format.

Leak Decoder /toilet-repair-diagnostic

Toilet Repair Diagnostic Guide & Fill Valve Sizing Engine

Decode phantom flush sounds, running water, and closet flange base leaks. Includes universal fill valve sizing and dye test protocol.

Engineering Standards & Compliance

3 Routes

E-E-A-T /about-methodology

Plumbing Calculation Methodology & Master Plumber Standards

Hazen-Williams friction loss derivation, thermal power transfer equations, and Master Plumber Advisory Board standards.

Legal /privacy-policy

Privacy Policy & Zero-Telemetry Data Safeguards

Statutory disclosure of client-side browser execution, zero server logging, and GDPR/CCPA consumer safeguards.

Directory /sitemap

Dynamic HTML Sitemap Index

This complete crawl directory providing immediate semantic discovery for search engine spiders and AI agents.

⚡

Machine-Readable XML Sitemaps & Feeds

Primary Index: sitemap-index.xml • Route Set: sitemap-0.xml • Media RSS Feed: rss.xml • LLM Manifest: llms.txt

PLUMBINGCALC ONLINE — MECHANICAL SIZING TELEMETRY

Official Contractor Job-Site Estimate & Code Verification Record

Date: September 27, 2026 Model Code: IPC 2024 Amendments · UPC Chapter 7 Standards

Client / Property Address:

Licensed Contractor / Company Name:

Master Plumber License #:

Permit / Job Reference #:

COMPUTED ENGINEERING SPECIFICATIONS & COMPLIANCE SUMMARY

Water Supply / Heating: Peak Demand Flow (GPM) · Firing Rate (BTU/hr) · ASSE 1070 Scald Limit (120°F) Verified IPC 501 / DOE 10 CFR 430

Sanitary DWV Drainage: Nominal Invert Drop (Inches) · Pitch Rate · Scouring Velocity (2.0–4.0 fps) Verified IPC Table 704.1 / UPC 702.1

Fixtures & Valves: Anti-Scald Pressure Balancing (ASSE 1016) · WaterSense 1.28 GPF Flush Standard Verified ASME A112.18.1 / A112.19.2

STATUTORY ADVISORY: This sizing docket reflects model plumbing code calculations performed on PlumbingCalc.online. Final pipe sizing, venting configurations, and gas/electrical service connections must be verified on-site by a licensed plumbing contractor and permitted by local building inspection authorities prior to commencement of work.

Licensed Contractor / Technical Inspector Signature

Homeowner / Authorized Client Acceptance