"Water heaters" — plural — typically reflects a buyer earlier in the journey than someone searching the singular. The plural search is often someone trying to understand the category before zeroing in on a specific product. This list is organized by the four water-heater types rather than as a single ranked list, so a buyer can identify which type fits their house before picking a model.
The four categories you are choosing between
Gas storage tank — 60% of US installs
40–80 gallons of water held at temperature, replenished by a 40,000-BTU burner. UEF 0.58–0.86 depending on atmospheric vs condensing design. Service life 10–15 years. Operating cost $24–$33/month for a typical household.
Top picks in this category: Rheem Performance Platinum 50-gal Gas (12-year warranty, $799), Bradford White RG250T6N (plumber-only, runs through power outages), AO Smith Vertex GAHH-50 (condensing, UEF 0.86, faster recovery).
Electric storage tank — apartments, no-gas homes, solar setups
Same form factor as gas, heated by two 4500W elements. UEF 0.92–0.95 — high per-unit efficiency but electricity costs more per BTU than gas in most US markets. Service life similar to gas. Operating cost $48/month for a typical household.
Top picks: Rheem Performance Platinum 50-gal Electric (12-year warranty, $749), Rheem Marathon 50-gal Lifetime (polybuthylene tank, lifetime warranty, $1,899), AO Smith Voltex Premium electric tanks.
Tankless (gas) — endless hot water, overlapping demand
No reservoir. 199K BTU condensing tankless heats water on demand. UEF 0.93–0.96. Service life 18–22 years. Operating cost $27–$31/month for typical households. Install premium is substantial — $3,500–$6,500 for retrofit conversion.
Top picks: Rinnai RU199iN Sensei (largest US service network), Navien NPE-240A (built-in ComfortFlow recirculation), Rheem RTGH-95DVLN (Rheem-channel value).
Heat-pump hybrid electric — lowest operating cost in most US markets
A tank with a heat pump on top. UEF 3.3–4.0 means it uses 70% less electricity than electric resistance. Operating cost $13/month for a typical household. Service life 12–15 years. Requires 750 cu ft of air around it (basement or large utility room only — not closet installs).
Top picks: Rheem ProTerra 50-gal Hybrid ($1,799 unit, often net-cost-neutral after federal + utility rebates), AO Smith Voltex Premium HPTU-66 (66-gallon for heavier demand), Bradford White AeroTherm (plumber-only).
How to narrow from category to model
- Check fuel source. Existing gas service? Default to gas tank or gas tankless. No gas? Electric tank, electric tankless, or heat-pump.
- Check install location. Closet install? Excludes heat-pump (needs 750 cu ft). Basement install? All four categories viable. Outdoor install? Limited to specific exterior-rated tankless models.
- Check household demand. 1–2 people sequential use? Any category works, even smaller. 4+ people with overlapping shower demand? Push toward tankless or upsized tank.
- Check existing electrical service. 100A panel? Electric tankless mostly excluded (most models need 200A). Heat-pump fine on 100A (30A dedicated circuit).
- Check climate. Cold-climate unheated install location degrades heat-pump efficiency. Northern climates with no gas and a 100A panel are best served by heat-pump anyway, just verify the install space stays above 50°F.
Three common mistakes when shopping plural "water heaters"
- Comparing across categories on price alone. A $599 electric tank looks cheaper than a $1,799 heat-pump, but the heat-pump's $35/month operating-cost savings ($420/year) means it costs less by year 4. Comparison must be all-in over 10 years.
- Assuming bigger is better. A 50-gallon gas tank delivers 87 gallons of hot water in the first hour. A 50-gallon electric delivers only 63. Reservoir size is not the relevant spec; first-hour rating is.
- Skipping the install location check. A heat-pump in a closet does not work. A gas tankless without a 3/4" gas line does not work. The unit must fit your house, not just your budget.