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9000
watt water heater California restaurant code requires 9000 watt electric water heater Can be accomplished several ways |
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imageBoth elements are 4500 watt @ 240volt, so why isn't this 9000 watt water heater? Illustration shows tank label, which is located on side of tank On right middle of label, reading top to bottom, label shows Phase 1, Volts AC, Upper element, Lower element, and Total connected watts. Look at Total Connected Watts and it shows 4500 watt @240 volt Label also shows 3375 watt @ 208 volt, since lower voltage will cause cooler element. Read more So if you have 240Volts, then this water heater is rated 4500 watts since total connected watts is 4500 @ 240V When upper and lower elements are each 4500 watt, and total connected is also 4500 watt, then it means that Both elements are NEVER are ON at same time. Upper element is ON while lower is OFF, or Lower element is ON while upper is OFF, or both elements are OFF Read how it works Label shows this is ordinary residential, 6-year, non-simultaneous 4500 watt water heater. Note also 'Phase' showing 1, which means single-phase electric power. If water heater was 3-phase, there would be 3 instead of 1. More about 3-phase commercial water heaters below. Note: 40 gallon, and 6 year warranty Note model number, serial number, product number to identify water heater warranty period to manufacturer, and to give you access to exact date of manufacture. Read: age of water heater/ pdf Note ashrae standard: "ASHRAE Standards and Guidelines are established to assist industry and the public by offering uniform method of testing for rating purposes, by suggesting safe practices in designing and installing equipment by providing proper definitions of this equipment. The creation of ASHRAE Standards and Guidelines is determined by the need for them, and conformance to them is completely voluntary." Note: Water heater tested to withstand 400 degrees F... this is for new, non rusted water heater, and assures safe product |
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Look
at total connected watts to figure water heater wattage This water heater is 4500 watt because 'Total connected watts' is 4500 @ 240Volt Resource: Figure volts amps watts of water heater Is water heater safe Water heater safety precautions Restaurant-waterheater- |
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This
water heater has two 5500 watt elements, and
'Total connected watt' is
5500 watt, so water heater is 5500 watt @ 240Volt If your voltage is 208V, then water heater is 4125 watts 208V divided by 240V = .8666 .8666 squared; .8666 x .8666 = .75 5500 watt x .75 = 4131 watt Many things affect actual watt output such as age of element, exact voltage, undervoltage, sediment and mineral build-up etc |
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Example
9000
watt water heater label Phase 1 means single phase Two 4500 watt elements @ 240 volt Total connected watts 9000 @ 240 volt This is simultaneous water heater Simultaneous tank is wired differently than non-simultaneous tank Resource: 3-phase water heater |
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Convert non-simultaneous 4500
watt to simultaneous 9000
watt
How to change 4500 watt water heater into 9000 watt water heater? Answer: Rewire tank for simultaneous operation/ 5 steps below (Rewiring will void tank warranty) |
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 Step
1: Check wattage of element:
Wattage printed on end of each element/ Pictured elements are 4000 watt @ 480 volt ... and 4000 watt @ 208 volt Elements burn out and can be changed, but usually the tank label is not changed if person installs element with different wattage. Check each element rating If 240Volt is applied to this element, the wattage would increase to 5333 watts @ 240V 208Volt divided by 240Volt = .866 .866 squared: .86666 x .8666 = .75 4000 watt divided by .75 = 5333 watt Buy: 480 volt (can be used single-phase or 3-phase element non-balanced): 4500 watt 480 volt  5500
watt 480 volt6000 watt 480 volt 480 volt elements Buy: 277 volt: 6000 watt 277 volt copper 6000 watt 277 volt stinless 277 volt elements Buy: 208 volt: 2000 watt 208 volt 208 volt elements Resources: Figure-Volts-Amps-Watts-for-water-heater. How to replace element How to test element |
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Step
2: Install elements rated 4500 watt @ 240Volt
This element is good/ it is rated 4500 watt @ 240Volt Elements burn out and can be changed, but usually the tank label is not changed if person installs element with different wattage. Check each element rating Resources: How to replace element How to test element |
$25 - $47 5 year warranty Ultra Low Watt Density/ ripple Hard water element Resists high mineral count Minimum 15" diameter tank Buy 240 volt: 4500 watt at Amazon 4500 watt at Amazon 13" diameter 5500 watt at Amazon Camco elements at Amazon Lifetime warranty 4500 watt +limited lifetime element Reliance / no extended warranty Low density/ ripple Min 13" tank Buy 240 Volt Reliance 5500 watt ripple at Amazon Reliance elements at Amazon |
$13 - $26 5 year warranty Ultra Low Watt Density/ foldback Hard water element Resists high mineral count Check minimum tank diameter Fits any tank above minimum dia Buy 120 volt 1500 watt 120 volt 8" minimum Buy 240 volt: 2500 watt at Amazon 3500 watt at Amazon 4500 watt at Amazon 5500 watt at Amazon Warranties do not cover dry fire (electricity ON before tank is full of water). Resource: Read about dry fire/ pdf page 2 |
$10 - $16 Camco/ no extended warranty Low Watt Density/ foldback Check minimum tank diameter Fits any tank above minimum dia Buy 240 volt: 2500 watt at Amazon 3500 watt at Amazon 4500 watt at Amazon 4500 watt 12 pack 5500 watt at Amazon 6000 watt at Amazon/ 17" minimum tank (6000 watts requires 8 gauge wire) Elements on this webpage are rated for AC voltages. AC elements with work with DC But Thermostats will melt with DC |
$10 - $12 Camco/ no extended warranty/ High Watt Density Standard on all new water heater Can use foldback as replacement Match volts and watts Check minimum tank diameter 120 Volt point-of-use water heater Buy 120 volt: 1000 watt 120 volt 8" tank diameter 1500 watt 120 volt 8' tank diameter 1650 watt 120 volt 7.5" minimum 1750 watt 120 volt 9" minimum 2000 watt 120 volt 9" minimum 120 Volt elements at Amazon Buy 240 volt 1500 watt at Amazon 2000 watt 12 pack 2500 watt at Amazon 3000 watt at Amazon 3500 watt at Amazon 3800 watt at Amazon 4000 watt at Amazon 4500 watt at Amazon 4500 watt 12 pack |
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Step 3: Identify wiring on
2-element 4500 watt non-simultaneous water
heater Side note: Red and black wires are reversed on lower thermostat-and-element with some brands water heater See image showing both options It makes no difference if red wire from L4 upper thermostat connects to lower themostat, while black wire from T4 connects to lower element. Purpose of reversing wires is to prevent rare problem where cracked or partially-shorted lower element from causing runaway heating that would continually trip upper thermostat reset button until lower element was replaced.. Read more In any event, all wiring is changed when converting to simultaneous 9000 watt water heater Resource: How to test element |
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Step 4: Replace lower themostat
with upper thermostat with red reset button Ordinary upper thermostat must replace lower thermostat Will snap into place of lower thermostat Wire colors vary. Typically the yellow and blue wires going to element are reversed when wiring water heter for simultaneous operation Reset button is required for simultaneous tank. Reset button will trip when sensing heat over 150 degrees. Since lower part of tank is no longer connected to upper thermostat, then the upper thermostat cannotdirectly stop overheating on lower part of tank. This is especially important safety feature... and larger tanks are more affected than smaller tanks since hot water rises, and would eventually trip reset on upper thermostat. Code requires ECO thermal cut-off or reset button on lower thermostat when water heater is simultaneous. |
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Buy residential upper and lower
thermostats Thermostats are interchangeable/ each works with your water heater Temperature range 90-150° Therm-o-disc/ reset trip @ 170° Temperature range 110-160° Aprom/ reset trip @ 180° Local YMCA hot tub = temperature 105°/... Typical shower-bath = 110°F Rated 120, 208, 277, 480 volt AC 89T is discontinued/ replace with Apcom or Therm-o-disc Buy: 90-150 degree F for residential tank: Buy 90-150° F for residential tank: Rheem UV11698 Rheem SP11698 Camco 08163 Aprom / 110-160° Water heater thermostats at Amazon Camco thermostats at Amazon More thermostats Resources: Therm-o-disc 59T-66T sell sheet/ pdf Therm-o-disc thermostats Difference between Rheem thermostats |
 Residential tank thermostat is rated 90-160° F Residential tank is NOT rated for pressure and temperature of 170-180° water. Only use 180 F thermostat on commercial water heater that is rated for high temperature Marathon water heater is rated 170 degrees F |
Commercial
upper and lower thermostats Commercial thermostats are used for 3-phase balanced and other commercial heaters rated for high temperature. Residential water heater TP valve will release water at 170° Buy:/ 3 phase water heater thermostat 120-180° F Upper thermostat Rheem SP8293 thermostat 110° to 170° Camco 120°F to 180°F Lower thermostat Rheem SP8295 lower 110° to 170° Camco 120° to 180°F lower Resources: Read more about 3-phase water heater |
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Step 5: Rewire tank for 9000 watt
simultaneous operation If tank has foam-fill insulation, the rewiring job can require long drill bit. How to rewire water heater if tank has foam insulation: Drill through top of tank at edge, and drill down through foam until upper thermostat cavity is reached. Then drill from electrical connection box on top of heater. Drill over to first drill hole. Drop 2 new wires from connection box on top of heater going into upper thermosta cavity. Connect new wires to existing tank wires that drop to lower thermostat-and-element Wire colors vary |
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Connect 9000 watt water heater to
single-phase 120-240Volt service (residential wiring) Add new 30 amp breaker and 10 gauge wire Connect both ground wires Makes sure all electrical connections are inside box with cover. |
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Respources: Two water heaters Color-codewire.html Water-heater-temperature-for- Restaurant-waterheater- How-electric water heater works.html How-to-replace-thermostat-on-electric-water-heater.html How-to-wire-water-heater-thermostats.html |
| WHQ4 24-hour 9000watt water
heater timer WHQ7 7-day 9000watt water heater timer   Respource How to wire GM 40 series timer |
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| All
wires must be same gauge. Only copper wire used. Solid wire only. No stranded wire. Only copper under screw plate, no insulation under screw plate. Maximum 2 wires under screw plate. Wires must be fully inserted under screw plate. And screw plate very tight against wires. Wires cannot run over top of thermostat or elements, and must be pushed aside. Wires can run over top of other wires, but not at point where wires are making connection to either element or thermostat. |
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| A common mistake with electric water heaters is the ordering and installing of a water heater with an upper element of 4500 watts, a bottom element of 4500 watts, and a total connected (or maximum) wattage of 4500 watts. On such a water heater only one element is operating at any one time. Many individuals do not observe the total connected wattage and incorrectly assume that because each of the elements is 4500 watts their water heater has an input rating of 9000 watts. | |
| Water heater manufacturers have specific procedures for rewiring an electric water heater so that the upper and lower elements are operating simultaneously. Some manufacturers only permit rewiring in the factory. Field modifications will normally void warranties and any listings that the unit comes with. Prior to acceptance of a field modified water heater, the local health agency should ensure that the modifications were performed according to the manufacturer's recommendations and with the approval of the local building officials. The data plate on a field modified water heater must be changed to reflect the total connected wattage rating with both elements operating simultaneously. | |
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