Is the A.O. Smith EETU-55 100 right for your home?
The A.O. Smith ProLine EETU-55 100 is a 55-gallon tall electric storage water heater with digital controls and a CTA-2045 grid-capable communication port. It may fit a household that needs more stored hot water and has room for a wider electric tank. At Water Heating Experts, we look at your existing installation, hot-water needs, clearances and electrical requirements before recommending equipment for homes in Palm Beach Gardens, Jupiter and surrounding communities.
A.O. Smith lists 55 gallons nominal and rated storage, a 75-gallon first-hour rating and 0.94 Uniform Energy Factor (UEF) in its exact-model technical specifications. The first-hour rating measures delivery during a standardized test; it is not the amount of water physically stored in the tank or a guarantee of continuous hot water.
What does grid-capable mean?
The EETU-55 100 has electronic controls for operating modes, vacation settings and diagnostics, along with a CTA-2045 EcoPort. This interface can support utility demand-response programs where available, using an appropriate utility-supported module. It does not mean Wi-Fi connectivity, rebates or lower electric bills are automatically included. Customers must confirm whether their utility offers a compatible program, what equipment it requires and whether participation would provide benefits.
Comparing grid-capable and conventional 55-gallon tanks
WHE also lists the A.O. Smith ENT-55 100, a conventional 55-gallon electric heater. Both have 55 gallons of rated storage and comparable physical dimensions. The ENT-55 lists a 72-gallon first-hour rating, while the EETU-55 lists 75 gallons and adds electronic controls and the utility communication port. For customers who do not plan to use a supported demand-response program, we’ll help determine whether the additional capabilities are useful.
The smaller EETU-50 100 grid-capable model is another option, with a narrower tank and a 62-gallon first-hour rating. We compare model size, peak demand and installation access before recommending a replacement.
Dimensions, water connections and electrical requirements
The EETU-55 100 measures 56½ inches high and 24 inches in diameter, with ¾-inch top water connections. These are tank dimensions—not the entire space needed for plumbing, electrical and digital-control access, drainage, the relief-valve discharge, removal and future service. We confirm clearances and site requirements before preparing the estimate.
The standard model operates at 240 volts and has two 4,500-watt elements with 4,500 watts maximum input in the standard non-simultaneous configuration. Manufacturer recovery is 21 gallons per hour at a 90°F temperature rise. We check the specific unit’s nameplate and existing wiring, breaker and circuit before specifying equipment.
Its technical specifications and published grid-capable sheet list 0.94 UEF. The product page’s introductory marketing paragraph states 0.92, but the exact-model specification table and manufacturer sheet agree on 0.94. This remains an electric-resistance storage heater, not a hybrid heat-pump model.
Tank protection and warranty
A.O. Smith identifies Blue Diamond glass tank lining, a CoreGard anode rod with stainless-steel core, a DynaClean sediment-reduction dip tube, a lower Incoloy heating element and a brass drain valve. These features do not replace regular care or attention to water quality. A six-year limited tank and parts warranty applies according to the written terms; manufacturer coverage is separate from installation labor and removal costs. Availability and final installation details are confirmed during the estimate.
EETU-55 100 frequently asked questions
Does the EETU-55 100 actually store 55 gallons?
Yes. A.O. Smith lists 55 gallons nominal capacity and 55 gallons rated storage. The 75-gallon first-hour rating is a separate measure of delivery in a standardized test.
Does grid-capable mean the heater connects to Wi-Fi?
No. The CTA-2045 port is designed to work with compatible utility demand-response equipment where a participating utility program exists. A supported module and program are required.
Does the grid feature guarantee rebates or savings?
No. Utility-program support, equipment requirements and possible benefits must be checked with the utility. We do not assume a specific incentive or program is available in Palm Beach County.
How is this different from the regular ENT-55 100?
The EETU-55 100 adds digital controls and CTA-2045 compatibility and lists a 75-gallon first-hour rating, versus 72 gallons for the conventional ENT-55 100. Both have 55 gallons of rated storage; WHE compares the features and installation needs.
Can WHE install this model in Palm Beach Gardens or Jupiter?
WHE serves Palm Beach Gardens, Jupiter and nearby communities. Mention EETU-55 100 when requesting a free estimate. We will confirm suitability, availability and installation scheduling before work begins.
Compare water heater replacements with WHE
Text us a clear photo of your current heater’s model and electrical label, plus a wider photo showing the connections and available space. We can compare other A.O. Smith water heater options and help select equipment suited to your household and installation.
Technical references: A.O. Smith EETU-55 100 product page, grid-capable specification sheet ARESS00122, and grid-capable electronic water heater installation and care guide. Technical table and specification sheet show 0.94 UEF, despite a conflicting introductory marketing claim. Confirm the actual supplied unit’s specifications before installation.