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Electric Water Heater
Commercial Light Duty Series
Model LDC  (30 – 119 – 12.1KW - 1 or 3 Phase)
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High Performance and High Efficiency

The Vaughn LDC Series water heaters incorporate a number of features not found in other conventional heaters which makes it better suited to resist the highly corrosive effects of hot water. The heart of a Vaughn water heater is a superior storage vessel which utilizes a specially formulated Hydrastone cement lining, solid copper-silicon threaded tank openings and a built-in heat trap device, all of which ensure a longer lasting and energy efficient water heater. When you specify and install a Vaughn LDC water heater, you will have confidence in knowing that the owner will be provided with a long lasting, trouble-free water heater.

Light Duty

cULus Listed

Heavy Duty Construction

  • 1/2" seamless Hydrastone cement lining provides long tanks life
  • Copper-silicon tappings cannot rust or corrode
  • High impact composite jacket eliminates damage during installation and transit. Will not rust or corrode.

High Efficiency

  • 2 inches of premium spray-in polyurethane foam insulation provide the industry's lowest standby heat loss
  • Hot water outlet with a built-in heat trap ensures efficient operation, keeping energy stored in the vessel
  • Commercial grade low watt density elements reduce mineral buildup and provide years of reliable hot water service.

No Sacrificial Anode Rod

  • Reduces operation expenses by eliminating periodic inspection and replacement costs associated with maintaining an anode rod

Warranty Information

  • 5 year limited tank warranty

Model LDC Water Heater Specifications

Capacities: 6 thru 120 Gallons
Orientation: Vertical
Voltages: 208 thru 600 Volt
Phase: 1 Φ and 3 Φ
Inlet Size:
3/4" Female NPT
Outlet Size: 3/4" Male NPT
Drain Size: 3/4" GHT
Relief Valve Size: 3/4" Female NPT
Relief Valve Type: T&P, 210°F, 150 psi
Thermostat Range: 110-180°F (Surface)
Hi-Limit: 190°F Manual Reset
Design Working Pressure: 150 psi
Design Testing Pressure: 300 psi
Elements: Copper or Incoloy Sheathed
Model S: 2" Polyurethane Foam
Model ME: 3" Polyurethane Foam
Tank Warranty:
Standard: 5 Year Non Pro-Rated
Optional: 10 Year Non Pro-Rated
Electrical Warranty: 1 Year
Jacket: High Impact Colorized Composite
Color: White and Black

Standard Equipment

  • Non-ferrous solid copper-silicon threaded openings for maximum corrosion resistance
  • Magnetic contactor(s) are heavy duty resistive load type rated for 200,000 cycles
  • Incoloy sheathed immersion heating elements
  • Built-in heat trap to improve operating efficiency (3/4" inlet/outlet models only)
  • Surface thermostat 110-180°F range
  • Surface safety hi-limit cut out with manual reset button (190°F)
  • Immersion safety hi-limit cut out with manual reset button (Standard on heaters 45 KW and above)
  • 1 1/2" Male NPT inlet/outlet connections (Standard on heaters 45 KW and above)
  • ASME/CSA rated temperature and pressure relief valve set at 150 psi, 210°F
  • 2" thick polyurethane foam insulation
  • High impact non-corroding colorized composite protective jacket
  • Cold water inlet diffuser with drain valve
Dimensions for Commercial Light Duty Heater

1 Φ Wattage and Dimensional Data

Dimensions (Inches) Shipping
Model S
Model ME
to Inlet
to T&P
30 S30 20 22.75 41.5 7 34 225
30 S30 20 22.75 41.5 7 34 225
40 S40 20 22.75 58.75 7 51 250
50 S50 22.75 25 51.5 7 43 300
65 S65 26 28 48 8 40 310
80 S80 26 28 58 8 51 375
100 S100 26 28 69.5 8 61 435
120 S120 28 30 69.25 8 61 450
30 S30U 25 22.75 33.25 7 24 250
40 S40U 26 28 33.25 7 24 275
Notes: 1. 120 volt models are available in 1500, 2000 and 2500 Watts only.
2. The 6, 10, and 20 Gallon models are available in lower element design only. All other sizes have both upper and lower element banks of identical wattage and are wired for non-simultaneous operation.

Recovery Capacity (Gal./Hour) For Various Wattages & Water Temperature Rises

Wattage 130° 120° 110° 100° 80° 60° 40° 20°
1500 4.6 5.0 5.5 6.1 7.6 10.1 15.4 30.7
2000 6.3 6.8 7.4 8.2 10.2 13.6 20.5 41.0
2500 7.8 8.5 9.2 10.2 12.8 17.1 25.6 51.2
3000 9.4 10.2 11.1 12.3 15.4 20.5 30.7 61.5
3500 11.0 11.9 13.0 14.3 17.9 23.9 35.9 71.7
4000 12.6 13.6 14.9 16.4 20.5 27.3 41.0 82.0
4500 14.1 15.3 16.7 18.4 23.1 30.7 46.1 92.2
5000 15.7 17.0 18.6 20.5 25.6 34.2 51.2 102.5
5500 17.3 18.8 20.5 22.5 28.2 37.6 56.3 112.7
6000 18.9 20.5 22.3 24.6 30.7 40.8 61.5 123.0
7200 22.6 24.5 26.8 29.5 36.9 49.1 73.8 147.6
9000 28.3 30.7 37.2 41.0 51.2 68.3 102.5 205.0
10000 31.5 34.1 37.2 41.0 51.2 68.3 102.5 205.0
12000 37.8 41.0 44.7 49.2 61.5 82.0 123.0 246.0


  • 1.5" Male NPT inlet and outlet water connections
  • Heating elements wired for simultaneous operation
  • Off-peak wiring for load management savings
  • Alternate voltages available
  • 4" hand hole cleanout for hard water application
Build Your Model


2" Foam Insulation
    3" Foam Insulation





Top Element



Lower Element






Model Number:

Commercial Light Duty Series Specific Questions

Why is dielectric isolation so important?

The unique design of the Vaughn heat exchanger electrically isolates the heat exchanger from the tank by means of a non conductive barrier installed between the two. This provides dielectric isolation between the tank and the heat exchanger thereby eliminating electrolysis between the two due to dissimilar metals. This feature is one reason why the Vaughn indirect water heater far outlasts competitor models.

What is a sacrificial anode and does a cement lined tank need one?

All water heaters constructed using a steel tank requires a lining to protect the internal steel surfaces from corrosion. Certain linings (i.e. glass and epoxy), due to their nature, have unavoidable holes and imperfections resulting in exposure of the steel tank. As a result of this deficiency, the manufacturer will install an anode rod(s) in an attempt to delay corrosion of the steel tank. An anode rod is typically made of aluminum, magnesium or zinc, is a maintenance item that requires periodic inspection and replacement, and is often times the cause of a “rotten egg” odor to your hot water. Often referred to as a sacrificial anode rod because, over time, it slowly dissolves, sacrificing itself as it is attacked by aggressive substances in the water which would otherwise attack the steel tank through the pinholes and imperfections of the glass or epoxy lining. A cement lined steel tank on the other hand does not require an anode because of the thickness and guaranteed 100% coverage of the cement lining over all internal surfaces of the steel tank. This eliminates the need for an anode rod in a cement lined water heater, resulting in a significantly longer life compared to a glass or epoxy lined water heater. For a further discussion please click on the following link Cement Lining

Why is there an upper and a lower heating element in my tank?

Vaughn Model S and ME water heaters with 30 gallon storage or more have both upper and lower heating elements in the tank, and models 20 gallon storage and less have one heating element in the tank. The purpose of having two heating elementsis to improve the recovery rating in a water heater of significant storage capacity. Sometimes referred to as a “Quick Recovery” water heater, this configuration allows the upper element to heat a much smaller volume of water (about 25% of the tank's capacity) before the lower element takes over. This provides a small amount of usable hot water quickly while you wait for the bulk of the water to heat. It is worth noting that in the standard dual element design, the upper and lower heating elements are interlocked so that only one can heat at any time, with priority to the upper element. Once the thermostat controlling the upper element is satisfied (i.e. at set point temperature) the lower element is allowed to heat. As an option, you may order your Vaughn water heater with the optional “simultaneous operation” feature which allows each element to operate independently, potentially allowing both to be on at the same time in order to increase the recovery rate of the heater.

General Questions

Are Vaughn heaters made in the USA?

Yes. Vaughn water heaters are all made in the USA and our factories located in Connecticut and Massachusetts and qualify for incentives under The Buy American Act and the American Recovery and Reinvestment Act (ARRA). For more information go to the following link Here.

Where can I purchase a Vaughn water heater?

There are numerous ways to purchase a Vaughn water heater depending upon the model you desire and your geographic location. The easiest way is either to visit our "Where to Buy" option in the red menu bar across the website, or contact Vaughn directly at 978-462-6683 and ask for the sales department where you will be directed to either our local representative or our order entry department for quick and easy ordering.

What code requirements are applicable for my installation?

The installation of water heaters are mostly governed by the Uniform Plumbing Code (or CPC in California), Uniform Mechanical Code, and National Electrical Code. These are standard codes that are used across the United States, and each state can amend them as they wish. To take it further, each city and county jurisdiction has assigned one or more building officials with what is called Administrative Authority. This Authority" allows each jurisdiction the right to interpret the codes as they see fit. Because of this many cities differ on their requirements. Vaughn strongly recommends that you contract with a plumbing engineer who knows and understands the intricacies of the building code requirements for your location.

Is it OK if my plumbing system has plastic pipes (PVC or PEX)?

Yes. All Vaughn water heaters will work with both types of plastic piping.

My question is not found in these FAQ’s, where do I look next?

Check out the Vaughn Product Center at Here for a complete listing of all technical Operation & Maintenance manuals documentation available by model. Get easy access to Installation Sales Brochures Service Bulletins Wiring Schematics Parts Breakdowns and various other technical documents related to the full line of Vaughn water heaters. Or if you prefer please call us at 978-462-6683 and ask to speak with Sales.


Technical Documents

Many of our products literature is available online for download. To open these files, a PDF viewer is required. If you do not have one, Adobe provides Acrobat Reader free of charge for viewing only. Use this link to download Acrobat Reader. You may also choose to download the file to your PC for future reference or printing. On most operating systems, simply right-click on the links below, choose "Save target as..." or "Save link as...", choose a location and it will save the document to your computer for future reference.

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26 Old Elm Street
P.O. Box 5431
Salisbury, MA 01952-5431
Tel: 978-462-6683
Fax: 978-462-6497

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