Is the Ruud PROE28 S2 RU95 B right for your installation?
This guide covers the Ruud PROE28 S2 RU95 B, the 28-gallon short model supplied with the insulation blanket required for its listed efficiency. The final B is important: Ruud also lists a different PROE28 S2 RU95 without that suffix. They have different rated storage and dimensions, so they should not be treated as interchangeable order numbers.
The B model has 26 gallons of rated storage, a 45-gallon first-hour rating and 0.92 UEF. Its bare tank is 30 inches high and 19¾ inches in diameter. That narrow-looking bare diameter is not the space needed after the supplied blanket is installed.
Image note: Ruud supplies one tall-tank photograph for this family. It is a representative manufacturer image; this short model has different proportions. The required blanket is not shown. Use the dimensions above to judge fit.
Ruud PROE28 S2 RU95 B specifications
| Exact model | PROE28 S2 RU95 B |
|---|---|
| Manufacturer classification | Short electric storage tank; indoor installation |
| Nominal capacity | 28 gallons |
| Rated storage | 26 gallons |
| First-hour rating | 45 gallons |
| Uniform Energy Factor (UEF) | 0.92 |
| Standard supply / elements | 240V AC, single phase; two 4,500W elements, non-simultaneous operation |
| Recovery at a 90°F temperature rise | 21 gallons per hour with the standard 4,500W configuration |
| A — tank body height | 30 inches before the blanket |
| B — height to water connections | 32¼ inches before the blanket |
| C — tank diameter | 19¾ inches before the blanket |
| Water connections | Top; ¾-inch NPT, shown on 8-inch centers in the series drawing |
| Required supplied external blanket | Yes; required to achieve the listed UEF. See the dimensional allowance below. |
| Approximate shipping weight | 95 lb; not the filled operating weight |
| Base limited warranty | Six years tank and parts for eligible single-family residential use; written terms apply |
Rated storage, first-hour delivery and UEF measure different things. They do not by themselves establish a number of showers or a household’s energy bill.
Dimensions, connections and replacement fit
Ruud’s single-asterisk footnote adds 2½ inches to tank height and five inches to diameter for the included blanket. Applied to this model’s bare dimensions, that is approximately 32½ inches high by 24¾ inches across the insulated body. This is a calculated planning envelope, not a replacement for the supplied installation drawing or additional connection and service space. Bare water-connection height B is 32¼ inches.
The supplied blanket is part of this model’s rated configuration. The older, general use-and-care manual linked by Ruud contains blanket language saying an additional blanket is unnecessary. The May 2024 model-specific sheet explicitly requires the supplied blanket on this B model to achieve its UEF. Follow the exact heater’s supplied blanket instructions; do not omit it based on that generic paragraph. Keep controls, labels and the relief-valve arrangement accessible as directed.
WHE checks the full delivery route, supporting surface, drain pan, nearby pipes and access to the front panels, drain valve and anode. The tank dimensions are not minimum installation clearances. We also review water pressure, thermal expansion and temperature-and-pressure relief discharge as part of the scope.
Compare nearby Ruud models
| Model | Nominal / rated gallons | First-hour gallons | Body height × diameter |
|---|---|---|---|
| PROE28 S2 RU95 B (short) | 28 / 26 | 45 | 30 × 19¾ in. before blanket |
| PROE36 S2 RU95 (short) | 36 / 33 | 46 | 31½ × 24¼ in. |
| PROE38 S2 RU95 B (short) | 38 / 35 | 51 | 31½ × 23 in. before blanket |
The 36-gallon short has 33 gallons of rated storage, compared with 26 here, and a 46-gallon first-hour rating versus 45. Its 24¼-inch body diameter is actually ½ inch less than the calculated insulated diameter of this 28 B. The 38 B adds more storage and first-hour delivery, but its blanket increases its 23-inch bare diameter to about 27 inches. Compare complete insulated footprints, not the bare-tank dimensions alone.
WHE sizes around peak use, including shower flow, tub volume and overlapping appliances. These standard configurations share 21 GPH recovery at a 90°F rise; a larger tank does not automatically reheat faster.
Electrical configuration and installation planning
Standard power is 240V AC, single phase, with two 4,500W elements operating one at a time. Ruud notes special-order electrical options; the ratings here are for the standard configuration.
WHE checks the delivered nameplate and wiring diagram against the available circuit. These conventional tanks have no combustion flue or heat-pump condensate system. If considering relocation from an attic to a garage, send photos of both locations for an estimate.
Maintenance and warranty
The series sheet lists stainless steel elements, an anode, Ruudglas tank lining, an EverKleen diffuser and a brass drain valve. Follow the supplied manual for sediment maintenance and anode inspection; the diffuser does not make the heater maintenance-free.
The linked AP16826-2 certificate (September 2014) provides six-year limited tank and parts coverage for eligible single-family use by the original owner, and lists one year for other locations. Labor, removal and reinstallation are excluded. Confirm the supplied certificate and retain your records. ProtectionPlus is a separate extension.
Manufacturer documentation and product-image notes
The specifications above come from Ruud’s May 2024 PROE RU N Rev. 16 specification sheet, linked from its Professional Achiever Standard Electric family page. Sources checked October 17, 2026.
The webpage’s model table uses the older Energy Factor label and shows 0.95 on many rows. EF and UEF are different measures; this guide uses the linked sheet’s model-specific UEF values. The webpage also describes a copper upper element while the sheet says stainless steel upper and lower elements. The sheet is the basis here, with the supplied nameplate and parts documentation checked for the actual heater.
Ruud also links the general AP9029-12 use-and-care manual (January 2015) and six-year limited warranty certificate. Use these references alongside the exact instructions delivered with the unit. A family photo or optional feature mentioned elsewhere on the page does not establish an included accessory.
Local installation help
Water Heating Experts helps homeowners in Palm Beach Gardens, Jupiter and nearby Palm Beach County communities compare fit and hot-water demand. Send photos of the existing label, full installation and surrounding space. Start with our Ruud installation page, review our electric water heater service, or compare the full model catalog. Availability and the complete installation price are confirmed with your estimate.
Ruud PROE28 S2 RU95 B FAQs
How much water does the PROE28 S2 RU95 B store?
It is a 28-gallon nominal model with 26 gallons of rated storage. The 45-gallon first-hour rating measures delivery during a standardized hour, including newly heated water; it is not the amount stored at once.
How much room does the included blanket add?
Ruud specifies an additional 2½ inches of tank height and five inches of diameter. The resulting calculated insulated body is about 32½ × 24¾ inches, before allowing for plumbing, the pan and service access.
Do both 4,500W elements run at the same time?
Not in Ruud’s standard configuration. The sheet specifies non-simultaneous operation, meaning the controls operate one element at a time. This is not a standard 9,000W simultaneous heater. WHE verifies the nameplate and circuit before installation.
Is the insulation blanket optional?
No. Ruud’s current sheet says the supplied blanket is required for this B model to achieve its listed UEF. Include the correct blanket allowance when checking fit and follow the instructions supplied with the heater.
Does the six-year warranty include labor?
No. Ruud’s linked certificate excludes labor, removal and reinstallation costs. The six-year tank and parts term is for eligible single-family use; the certificate sets different terms for other installations. ProtectionPlus is a separate extension, not the base warranty.