Data sources
Every figure on this site traces back to one of these. License class, attribution obligation, fetch cadence and last-fetched date, before any number derived from it ships.
- BLS Employment Cost Index -- Construction, wages and salaries — license class P
- BLS Producer Price Index -- Heating Equipment Manufacturing — license class P
- CPSC SaferProducts (consumer product recalls) — license class P
- DOE Compliance Certification Database — license class P
- DOE Energy Saver -- Sizing a New Water Heater — license class P
- EIA Electricity Retail Sales (state average residential price) — license class P
- ENERGY STAR Certified Water Heaters (US EPA) — license class P
- EPA eGRID (regional grid carbon intensity) — license class P
- National Residential Efficiency Measures Database (REMDB) — license class P
- OpenEI Utility Rate Database (URDB) — license class P
- US Census Bureau ZCTA-to-County Relationship File — license class P