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Type guides, state costs, model specs, and brand pages.

Heater Types

Heat Pump Water HeatersHigh-efficiency electric replacements and hybrid tanks.Condensing Tankless Water HeatersCondensing whole-home flow with venting constraints.Gas Tank Water HeatersStraight swaps when gas storage is still the fit.

Plan Your Swap

Sizing guideCapacity, first-hour rating, and temperature-rise fit.Accessories hubInstall extras, code-adjacent parts, and paid-link accessory picks.Upgrade from NHP50Replacement candidates and projected operating-cost delta.Upgrade from NHP65Replacement candidates and projected operating-cost delta.Upgrade from NHP80Replacement candidates and projected operating-cost delta.Upgrade from NPE 210S2Replacement candidates and projected operating-cost delta.Upgrade from PROE50 T2 RH95Replacement candidates and projected operating-cost delta.HPTA 50 2 vs HPTA 80 2Side-by-side specs, efficiency, and fit differences.HPTS 50 2 vs NHP50Side-by-side specs, efficiency, and fit differences.NHP120 vs PROPH80 T2 RH400 30Side-by-side specs, efficiency, and fit differences.NPE 210S2 vs NPE 240S2Side-by-side specs, efficiency, and fit differences.

Guides & Data

California heat pump guideLocal rates, rebates, and operating costs.Colorado heat pump guideLocal rates, rebates, and operating costs.Massachusetts heat pump guideLocal rates, rebates, and operating costs.Oregon heat pump guideLocal rates, rebates, and operating costs.Washington heat pump guideLocal rates, rebates, and operating costs.DOE 2029 standardsWhat changes in 2029 and which product classes move first.

Brands

A.O. Smith Water HeatersPublished models, product lines, and brand coverage.Bradford White Water HeatersPublished models, product lines, and brand coverage.Navien Water HeatersPublished models, product lines, and brand coverage.Noritz Water HeatersPublished models, product lines, and brand coverage.Rheem Water HeatersPublished models, product lines, and brand coverage.Rinnai Water HeatersPublished models, product lines, and brand coverage.Takagi Water HeatersPublished models, product lines, and brand coverage.
Methodology

How we build each page

Where our data comes from, how we process it, and what must be true before a model page goes live.
Every field on every page carries a source tag. This document explains the system behind those tags.

Source hierarchy

We use a tiered source system. When values conflict between sources, the higher-tier source wins.

1
ENERGY STAR certified product data
DOE-validated performance metrics: UEF, first hour rating, annual energy use, draw pattern. This is the federal test record.
2
Manufacturer specification sheets
PDF spec sheets and engineering documents. Dimensions, electrical requirements, venting specs, warranty terms.
3
Manufacturer product pages
Brand websites. Supplemental specs, feature details, WiFi capability, operating modes.
4
Retailer and distributor listings
Used only to fill gaps in dimensions or features not published elsewhere. Always tagged as "Retailer listing" or "Distributor listing" in the source block.

Every data field on every model page carries a source tag. When a field comes from a lower-tier source, the source block on the page makes that visible.

Publish criteria

A model page is only generated when the record passes all required checks. Models that fail any check remain in the database but do not appear on the site.

Required to publish
  • Brand and model number identified
  • Type and fuel source classified
  • UEF (Uniform Energy Factor) present
  • Storage capacity or flow rate present
  • Height and width dimensions present
  • Warranty data present (tank or parts)
Tracked but not required
  • Depth and weight
  • Breaker size and wire gauge
  • Sound level (heat pumps)
  • WiFi capability
  • Amazon ASIN (for affiliate link)
  • Indoor/outdoor classification

Cost calculations

Annual operating costs use the model's DOE-tested annual energy consumption multiplied by the U.S. average residential energy rate from the Energy Information Administration (EIA). State-specific pages use state-level EIA rates.

These are estimates based on standardized test conditions, not guarantees of actual household costs. Your home's usage pattern, inlet water temperature, climate, and utility rate structure will affect real-world costs.

Rankings

When we rank models, rankings are within a specific class: same type and similar capacity range. We rank on published specifications only: UEF, height, first hour rating, and flow rate.

We do not use subjective scoring, user reviews, or editorial judgment. Tied values receive the same rank. Classes with fewer than 8 models do not show negative rank badges to avoid overstating the significance of small-sample rankings.

What we do not promise

We do not promise that every page is complete, current, or fit for your project. Rebate programs, legal standards, warranty terms, and product details can change after publication. The site is provided for informational use only and should not be treated as a substitute for live manufacturer documents, permits, or professional advice.

Manufacturer names, marks, and model numbers belong to their respective owners. We use them only to identify the products being referenced.

Corrections

If you find an error in our data, email corrections@ratingplate.com with the model number, the correct value, and the source document so we can verify and update.