Is the Ruud PROE40 M2 RU95 right for your installation?
The Ruud PROE40 M2 RU95 provides the same listed storage and first-hour delivery as the tall 40 in a lower, slightly wider shape. It has 40 gallons nominal capacity, 36 gallons rated storage, a 55-gallon first-hour rating and 0.93 UEF. Its body is 48¼ inches high by 20¼ inches in diameter.
This can be a sensible model to compare when an existing tall heater is difficult to service beneath overhead plumbing. The medium version brings the water-connection height down to 50½ inches. WHE still checks the pan, valve layout and anode access; a lower tank is helpful only when the complete installation is accessible.
Image note: Ruud supplies one tall-tank photograph for this family. It is a representative manufacturer image; this medium model has different proportions. Use the dimensions above to judge fit.
Ruud PROE40 M2 RU95 specifications
| Exact model | PROE40 M2 RU95 |
|---|---|
| Manufacturer classification | Medium electric storage tank; indoor installation |
| Nominal capacity | 40 gallons |
| Rated storage | 36 gallons |
| First-hour rating | 55 gallons |
| Uniform Energy Factor (UEF) | 0.93 |
| 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 | 48¼ inches |
| B — height to water connections | 50½ inches |
| C — tank diameter | 20¼ inches |
| Water connections | Top; ¾-inch NPT, shown on 8-inch centers in the series drawing |
| Required supplied external blanket | No required-blanket footnote on this model’s specification row |
| Approximate shipping weight | 106 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
The 50½-inch connection height is more useful than body height alone when planning how existing pipes will meet the replacement. Check the closet door swing and front access panels as well as the tank diameter. A tight corner can leave enough room for the cylinder while preventing future element or drain-valve service.
Ruud does not attach a required external-blanket footnote to this model’s row. Do not add another model’s blanket dimensions or assume an optional accessory is included. The exact supplied equipment and instructions govern the finished installation.
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 |
|---|---|---|---|
| PROE40 M2 RU95 (medium) | 40 / 36 | 55 | 48¼ × 20¼ in. |
| PROE40 T2 RU95 (tall) | 40 / 36 | 55 | 60¾ × 19¼ in. |
| PROE50 M2 RU95 (medium) | 50 / 45 | 62 | 48 × 23 in. |
The tall 40 is one inch narrower but has a 60¾-inch body and 63⅝-inch water-connection height. Its storage, first-hour rating and UEF match this medium model. The medium 50 is almost the same body height—48 inches—but widens to 23 inches. It adds nine gallons of rated storage and seven gallons of first-hour delivery. That makes width the important measurement when considering a capacity increase in a location that already fits the medium 40.
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 PROE40 M2 RU95 FAQs
How much water does the PROE40 M2 RU95 store?
It is a 40-gallon nominal model with 36 gallons of rated storage. The 55-gallon first-hour rating measures delivery during a standardized hour, including newly heated water; it is not the amount stored at once.
Can I increase capacity without adding much height?
The medium 50 is 48 inches high at the body versus 48¼ inches for this medium 40, but its diameter increases from 20¼ to 23 inches. WHE must check the wider footprint, pan and delivery route before recommending that change.
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.
Does the series name guarantee smart controls or automatic leak shutoff?
No. The documents used for this guide do not establish Wi-Fi or automatic leak shutoff as included features of this exact standard model. The webpage mentions System Sentinel only for selected configurations; it is not assumed included here.
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.