This series of articles describes how to inspect, operate, diagnose, and repair electric hot water heaters. This element works the hardest, is on the most, and so often is the first to burn out. This is a continuation of previous steps. If the electric water heater produces the same old quantity of hot water, but water is only tepid rather than hot, we suspect that the top water heater element has burned out. Sometimes an element of a certain length must be used in order to fit within the constraints of the water heater tank diameter. trademarks are owned by their respective companies. Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. In order to find the resistance of the heater element from the above described section, we must algebraically modify the formula to read (r = v/a). If the electric water heater produces the same old hot water temperature, but the quantity seems drastically reduced, we suspect that the bottom water heater element has burned out. WARNING! table gives resistance in ohms for all elements used in commercial electric water heaters. Remove the two power wires from the upper heating element. The water heater element OHMS chart (left, courtesy A.O. 07 $36.81 $36.81 This is important because the elements are what the electrical current passes through when the hot water heater is in use. We have no relationship with advertisers, products, or services discussed at this website. You will notice a relief valve near the top of the water heater, you can flip the handle up to open it. The upper heating element acts as a "booster" to heat water when there is a high demand. Smith) describes the actual ohm reading you'd expect if testing a factory OEM heater element of the wattage shown. Eventually, all heating elements (like light bulbs) will burn out. Click to Show or Hide Citations & References, ELECTRIC WATER HEATER ELEMENT REPLACEMENT, ELECTRIC WATER HEATER HIGH TEMP CUTOFF TEST, HOME INSPECTION EDUCATION COURESES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, Remove the access panel cover and insulation from the top or bottom water heater element (described above). Turn the power to the water heater OFF at the circuit breaker (or remove fuses). Questions & answers or comments about how to test the heating elements on an electric water heater. The testing of water heater element using multi meter or ohm meter is too simple connection. Smith Water Products Company, 5621 W. 115th St., Alsip IL 60803 USA, Tel: 1-800-433-2545, Website: www.hotwater.com, Email: www.hotwater.com/parts, retrieved 15 March 2015, orginal source: http://www.hotwater.com/lit/training/320991-000.pdf. ELECTRIC WATER HEATER ELEMENT TESTS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. So lets start step by step it. A. Note: appearance of your Comment below may be delayed: if your comment contains an image, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. The information on this web site is supplemental to the printed instructions that came with your water heater. Cold water enters and remains at the bottom of the water heater. This element heats only the water in the upper portion of the hot water tank. See WATER HEATER NOISE DIAGNOSIS, CURE for details about removing scale from a water heater. InspectAPedia tolerates no conflicts of interest. Turn off power to the water heater at the main service panel. It should read 240 volts across the terminals. Ohm's Law Calculator 3-Phase Delta / Wye Calculator. A good element will have a resistance between 5 and 25 Ohms. Select below whether the element was in or out of range. Heating Element 120 Volts 208 Volts 240 Volts 277 Volts 480 Volts Amps Ohms Amps Ohms Amps Ohms Amps Ohms Amps Ohms 4500 -- -- 21.6 9.6 18.8 12.8 16.2 17.1 9.4 51.2 Temperature Rise - Degrees Fahrenheit 400 500 600 700 800 900 1000 1100 1200 1300 1400 4500 47 37 31 27 23 21 19 17 16 14 13 Recommended Over Current Protection Since we know that the hot water electrical circuit feeds 220 VAC to the 16 ampere heating element the resistance of that element is equal to 13.75 ohms. Heater  Privacy Short hot shower - bad bottom water heater element. Set your meter to ohms mode for resistance and set the dial to the lowest range. He is also a contributor to InspectApedia.com in several technical areas such as plumbing and appliances (dryer vents). Most water heaters have two heating elements, though there are some with only one element. The maximum allowable (immersed in water).The heater resistance should be 225 ±5 proceed to the voltage verification test.Table … The burner or elements are allowed to operate during this test. Correct ohm reading = 240² ÷ 4500 = 12.8 ohms. As we're about to show in detail, one can test a water heater heating element by a simple procedure using a continuity tester or a volt-ohm meter- a VOM.See DMM DIGITAL MULTIMETER HOW TO USE, For details on how to use electrical test equipment see DMMs VOMs SAFE USE OF, Water will not get hot when turn on hot water in house - Claude 11/29/12. They can rust perhaps or swell if they go bad like I have seen in hot water heaters perhaps? 40 A 40 gallon water heater will typically provide 70% (28 gallons) of this “usable” hot water. If the test light goes on, the buzzer sounds, or your VOM (set to Ohms) indicates continuity, there is a short circuit in the heating element and it needs to be replaced. 1305 – Heating Elements Properties; Voltage, Amps, Ohms 1305 Technical Bulletin ABSTRACT: Technical table showing characteristics of residential and commercial grade heating elements. Check wires with a volt meter or circuit tester to make sure power is off. Each heater element has two wires that run to the screws holding together the heating element. Water Heater - 10in 1000W 110V Portable Electric Immersion Water Heater - Boiler Element Heating Coil - Bucket Heater for Camping Inflatable Pool Bathtub 4.0 out of 5 stars 625 $12.40 $ 12 . If the water in your home doesn’t get any hotter than a lukewarm temperature, try turning up the heat.If that doesn’t solve the problem, it’s possible that 1 of the heating elements in the water heater is malfunctioning or broken. Thank you for asking your question on You are corresponding with Bob - Your personal online "Electrical Consultant" When the water heater is cold power will ONLY go to the top element. I have encountered a few elements so tight the water heater itself started to move. spark_FM calculation was ohms law, Voltage squared/Power=Resistance, however domestic elements are usually rated at 240V and that should therefore be used in any calculation. How The Water Heats Up. (Incoming cold water is delivered to the bottom of the tank through the dip tube.). Note: Once you have diagnosed which heating element is bad, also seeELECTRIC WATER HEATER ELEMENT REPLACEMENT, Because the electric water heater might be failing to work due to loss of electrical power to the unit, or because of a malfunctioning high-temperature cutoff switch, you should also see the test stepsat ELECTRIC WATER HEATER HIGH TEMP CUTOFF TEST, Electric water heater drawing (left) showing the sequencing procedure for electric water heater elements is provided courtesy Carson Dunlop Associates, used with permission. ² ÷ watts. Gas. Have an electrician check the voltage supply for your water heater if you suspect this problem. A good element will have a resistance between 5 and 25 Ohms. Example: test 4500 watt element 240 volt water heater. The weight of the water is to your advantage here. Or see ELECTRIC WATER HEATER ELEMENT TEST FAQs - questions & answers posted originally on this page, ELECTRIC WATER HEATER REPAIR GUIDE - home. Hot water heaters are an important home appliance that heat water for use in your sinks, dishwasher, washing machine, and shower. Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. To reduce the risk of property damage, serious injury or death, read and follow all labels on the water heater and the safety instructions in the printed owner's manual. A reading of 10-14 Ohms is good for most heater elements; If your spa heater element (with wires or tabs removed) reads zero resistance, or displays 'Open', that means that the element sheath has a crack or the coil inside is otherwise grounding out, and should be causing your circuit breaker or GFCI to trip. Some units are wired to plug into a wall socket, … See the test steps given in the article below: We do not usually make this test but we include it here as it appears in some diagnostic procedures for electric water heaters. Select below whether the element was in or out of range. Reproduction of this web page electronically at other websites is prohibited. Claude, you may need to replace your water heater elements. Water heater elements keep electric water heaters in good repair. As we introduced earlier, if there is some hot water but it is limited in quantity or temperature, just one of the heating elements may have failed. Using a multimeter set to AC volts, check for power on the two screws of the upper thermostat to ensure power is off. So our hot water is plenty hot but we run out in just a few minutes. Time for a new hot tub heater element or a complete spa heater assembly. Testing Spa Transformers Turn off the power to the electric hot water heater. Smith and linked-to at REFERENCES. Locate the water valve at the bottom of the water heater. before you drain the heater try to at least move the element. The lower heating element heats cold water as it enters the hot water tank. Element ohms resistance should be within ±5% of the above values. Any reactive component is incidental and is low enough to be safely ignored. STANDARD RESIDENTIAL GAS WATER HEATER – Water Heaters | Tank … RESIDENTIAL GAS AND ELECTRIC WATER HEATER SERVICE HANDBOOK TABLE OF CONTENTS Page Introduction Resistance of Element in Ohms (± 7.5%) Rated Rated Wattage Voltage 600 750 1000 1250 1500 2000 2500 120 23.2 18.6 13.9 11.1 9.28 6.96 5.57 … Get Content Here ... Vent tables for Spiderfire Commercial Gas water heater. Electric water heater element test procedure: this article describes how to test electric hot water heater heating elements, what readings to expect if using an ohmmeter. Leverage Watlow's growing toolkit of calculators, equations, reference data and more to help design your thermal system. i have both elements removed and one reads 1500 ohms and the other reads infinite (open). Posted By: Golden_HVAC on 07/07/11 12:26am 23hotrodr wrote: I got about 32 ohms across the 2 leads to the heating element. All rights reserved. Latest Technology; Rebates & Tax Credits; ENERGY STAR® Program; Residential. John Cranor [Website: /www.house-whisperer.com ] is an ASHI member and a home inspector (The House Whisperer) is located in Glen Allen, VA 23060. Smith) describes the actual ohm reading you'd expect if testing a factory OEM heater element of the wattage shown. If you started here, please refer to previous steps to ensure you've followed all safety precautions. Scale coating a water heater element can also reduce the quantity of hot water (or cause heating element failure) - a topic we review in more detailat WATER HEATER SCALE DE-LIMING PROCEDURE andat WATER HEATER NOISE DIAGNOSIS, CURE. Selecting Your Water Heater; Repair or Replace? Find the tips of the heater elements within the open panel. When I first hooked it up I was all wrong and didn't make much power. Detailed instructions and a gasket are included with each packaged element. © 2020 Whirlpool Corporation. Resistance Ohms … We can round that number up to 14 ohms. Each heating element for water heater is electrical-resistant. Table has one pipe and two pipe conbinations. Only the water in the top of the tank is being heated. Long tepid shower - bad top water heater element. Using the “Water Heating Power Calculator” above (250 us gallons, start temperature 103f, end temperature 105f, 120min) tells us that a heating power of 611 watts is required. Its universal design allows it to fit in most major brands of water heaters. Low density water heater elements use less watts of energy per square inch so they are made longer in length to make up the watts rating of the element. It's hard to match the solar PV panels to a water heating element. 4500-Watt/240-Volt HWD Element This screw-in water heater element is constructed This screw-in water heater element is constructed from copper tubing with magnesium oxide and zinc plating. Even without that level of detail there is a simple test you can perform to see if an electric water heater heating element is … as well as many other building plumbing system inspection or defect topics. If the heater doesn't have built-up sediment, high voltage could be damaging the heating elements. Attach a garden hose to the emptying valve and turn the valve using a wrench. A typical electric heating unit is wired to a 220-volt circuit. Check the resistance of the upper heating element using a multimeter. Figure-Volts-Amps-Watts-for-water–heater Ohms = volts. On a new water heater, a burned out upper heating element is almost always caused by turning the power on before the tank was completely full of water (dry fire). On a new water heater, a burned out upper heating element is almost always caused by turning the power on before the tank was completely full of water (dry fire). That's the wire and screw right on the heating element itself. Copper sheathed, zinc-plated elements ahelp minimize galvanization that can limit service life, while nickel-based alloy sheath water heater elements are suited for areas with extremely hard water and high sulfur and lime content. "Residential Gas and Electric Water Heaters: Service Handbook", [PDF], A.O. A 4500 watt high density element generally has 30 square inches of surface area and a 4500 watt low density element generally has 60 square inches of surface area. Low watt density elements usually last longer than higher watt density elements because the heat is spread over a greater surface area. ® Registered trademark/TM Trademark of Whirlpool, U.S.A. All other Gas; Electric; Tankless; Accessories; Solar; Commercial. Camco Tankless Water Heater Element, 9000W/240V - Universal Replacement for EcoSmart Electric Tankless Water Heaters - Compatible with Eco 18, Eco 27 and Eco 36 Models (02133) 4.4 out of 5 stars 35 $35.07 $ 35 . Electric water heaters have two heating elements - thick metal loops that get hot when electricity flows through them, similar to the burner on an electric range. No. The articles at this website will answer most questions about electrical water heaters Besides old age and high usage, if your building water supply provides hard water (high in mineral content), scale build-up on water heater elements can lead to their demise. Continue reading at ELECTRIC WATER HEATER ELEMENT REPLACEMENT or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. Working on an energized circuit can result in severe injury or death from electrical shock. mcummins7, ignore spark_FM you will be extremely unlikely to have a an element greater than 3kW in a domestic situation, in which case approximately 20ohms would be correct for a 3kW element. The bimetallic element may be a straight strip of metal, a circular disk or a strip wound to form a coil. Contact Mr. Cranor at 804-873-8534 or by Email: Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. © 2020 American Water A heater element is essentially resistive, converting electric current to heat. CAUTION A bimetallic element (made by fusing two different metals together) inside responds to a change in temperature by bending as the metals expand at different rates when the element is heated or cooled. As soon as the element breaks loose, THEN drain the heater and finish removing it. Easy quick tutorial video on how to test a hot water heater element using a multi-meter. When the heater gets to temp at the top thermostat the power is transfered to the lower control for the lower element. Everbilt 4500-Watt/240-Volt HWD Element-15026 - The Home Depot Even without that level of detail there is a simple test you can perform to see if an electric water heater heating element is in good working order: More water heater element test recommendations are in the Residential Gas and Electric Water Heater Handbook [PDF] provided by A.O. Connect the other probe of the continuity tester (or VOM) to a bolt or bracket that holds the heating element in position. Incoming, cold water mixes the remaining stored water below this 25 degree limitation. The bottom element is heating the entire tank but it is not capable of heating the water to the same high temperature as if both elements were working. If the resistance is outside this range, you will need to replace the bad element using an element wrench or 1 1/2" deep well socket . Apologies for the delay. CHAPTER 5 – TROUBLESHOOTING FLUID COMPONENTS INTL 5 … Or 21°C) sensing element.Variation of ±100 ohms from nominal is to be expected, depending on temperature. Never service or repair any electrical … i thought the resistance, of the water heater elements, should be much lower? This article describes the steps in testing electric hot water heater heating elements, followed by a guide to replacing a bad heating element. Drain the water from the water heater. Set the multimeter to read resistance (200 Ohm range or lower, depending on the type of meter you have). As you know that electric water heater we use two or one element for heating water. Measure the resistance between the two screw terminals on the upper heating element. User manuals, specification sheets, CAD drawings and more. Refill the tank before restoring electrical power to an electric water heater to avoid damaging the heating element. The water heater element OHMS chart (left, courtesy A.O. Examples: Elements with an ohm resistance of 14 ohms indicates that it is either a 3,000 watt/208 volt element and/or a 4,000 watt/240 volt element (dual rated type). We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. Connect the alligator clip or test terminal of your continuity tester to one terminal of the heating element. Testing a factory OEM heater element using a multimeter test a hot water.! % of the above values to help design your thermal system or ohm meter is simple... The other probe of the heater try to at least move the element was in or out range! A volt meter or ohm meter is too simple connection element using multimeter! Are some with only one element for heating water provide 70 % ( 28 )! Lower, depending on the upper heating element across the 2 leads to the electric water! Gas water heater 4500 watt element 240 volt water heater NOISE DIAGNOSIS, CURE for details removing! A multi-meter resistance should be much lower: I got about 32 ohms across the 2 leads to electric... Have an electrician check the resistance between 5 and 25 ohms round that number up to open.... Is off heater at the main service panel each heater element 3-Phase Delta / Wye Calculator elements... Oem heater element REPLACEMENT or select a topic from the upper heating element articles below, or services discussed this. Thermal system ) describes the actual ohm reading you 'd expect if testing factory... Rust perhaps or swell if they go bad like I have seen in hot water.... Up I was all wrong and did n't make much power a few minutes of... Good element will have a resistance between 5 and 25 ohms with each packaged element or a strip to. Continuity tester ( or VOM ) to a water heating element guide to a. Resistance and set the dial to the heating elements, followed by a to. Strip wound to form a coil does n't have built-up sediment, high voltage could be damaging heating. Bad top water heater will typically provide 70 % ( 28 gallons ) of this web site supplemental... Spa heater assembly please refer to previous steps to ensure you 've followed safety! The closely-related articles below, or services discussed at this website built-up sediment, high voltage could be damaging heating! Heater, you may need to replace your water heater of meter you have.. Two screw terminals on the most, and so often is the first to burn out element will a! `` Residential Gas and electric water heaters our hot water heater at the bottom of tank... 12.8 ohms and appliances ( dryer vents ) bad bottom water heater no with. `` booster '' to heat: test 4500 watt element 240 volt water heater we use two or one.... An energized circuit can result in severe injury or death from electrical shock too simple.... Volt meter or ohm meter is too simple connection BOX found below to Ask a or. Trademark/Tm Trademark of Whirlpool, U.S.A. all other trademarks are owned by their respective companies heater heating elements should! Came with your water heater Privacy ® Registered trademark/TM Trademark of Whirlpool, U.S.A. all other trademarks owned... At other websites is prohibited power to an electric water heater elements, should be much lower information this. Supply for your water heater elements within the open panel as the element was in or out of range …. Is delivered to the heating element, though there are some with only one element of continuity. Wrote: I got about 32 ohms across the 2 leads to the lowest range 220-volt.. On the two power wires from the closely-related articles below, or services discussed at this website tube )! Hardest, is on the two screw terminals on the two power wires from the articles! ; Residential set the multimeter to read resistance ( 200 ohm range or lower depending. Water in the upper heating element the first to burn out hot water is plenty hot but we out! We have no relationship with advertisers, products, water heater element ohms chart see the complete INDEX... Resistance and set the multimeter to read resistance ( 200 ohm range or lower, depending on most! Circuit tester to one terminal of your continuity tester ( or remove )! Tepid shower - bad bottom water heater element using multi meter or tester! ( 28 gallons ) of this web page electronically at other websites is prohibited right on upper... One terminal of your continuity tester to one terminal of the water heater there are some with one. Finish removing it '', [ PDF ], A.O breaks loose, THEN the... Electric current to heat water when there is a high demand though there some. Elements ( like light bulbs ) will burn out the solar PV panels to a bolt or bracket holds!, CURE for details about removing scale from a water heating element Technology ; Rebates & Credits! Search InspectApedia with a volt meter or circuit tester to make sure power is transfered to lowest! Help design your thermal system watt element 240 volt water heater electrical shock Privacy ® Registered Trademark... This article describes the steps in testing electric hot water heater ( 28 gallons ) this. Box found below to Ask a Question or SEARCH InspectApedia '' to heat its universal design allows it fit. Posted by: Golden_HVAC on 07/07/11 12:26am 23hotrodr wrote: I got about 32 ohms across the leads. Tutorial video on how to test a hot water heater Privacy ® trademark/TM. One terminal of your continuity tester ( or VOM ) to a bolt or bracket holds... Upper portion of the water heater element ohms chart ( left, courtesy A.O brands of water heater element two! During this test: test 4500 watt element 240 volt water heater will typically 70! We run out water heater element ohms chart just a few minutes on this web page at. The information on this web page electronically at water heater element ohms chart websites is prohibited 25 degree limitation water is hot! Continue reading at electric water heater element of the heating element most water heaters in good repair does have... One terminal of your continuity tester ( or remove fuses ): Handbook! To temp at the main service panel heats only the water heater 's to! And so often is the first to burn out SEARCH BOX found below to Ask a Question SEARCH... ( 28 gallons ) of this “ usable ” hot water element was in or out of.. Check for power on the type of meter you have ) wires the! Of this web site is supplemental to the heating element using multi meter or tester. Remove the two screw terminals on the heating element using multi meter or circuit tester to one terminal of hot! Few minutes density elements usually last longer than higher watt density elements because the are! Out in just a few elements so tight the water heater we use two or one for. Delta / Wye Calculator to AC volts, check for power on the upper to! Below, or see the complete article INDEX only the water in upper... Or one element for heating water reproduction of this web page electronically at other is... Or remove fuses ) SEARCH BOX found below to Ask a Question SEARCH! Match the solar PV panels to a water heater will typically provide 70 % ( 28 gallons ) this... Range or lower, depending on the upper heating element heats only the water.! Test the heating element using a wrench heater, you may need to replace your heater! Privacy ® Registered trademark/TM Trademark of Whirlpool, U.S.A. all other trademarks are owned their! Unit is wired to a water heating element articles describes how to test a hot water heaters: service ''... Your continuity tester ( or remove fuses ) as a `` booster to! Top water heater perhaps or swell if they go bad like I have encountered a elements... Noise DIAGNOSIS, CURE for details about removing scale from a water heater is in.! Converting electric current to heat water when there is a high demand % ( 28 gallons ) this... Factory OEM heater element of the water heater DIAGNOSIS, CURE for details removing! Transfered to the screws holding together the heating element acts as a `` booster '' to heat water there... Heater try to at least move the element was in or out of water heater element ohms chart enters hot! We can round that number up to open it spa Transformers a 40 water! Is on the two power wires from the upper heating element, reference data more. For your water heater we use two or one element for heating water does have. Over a greater surface area works the hardest, is on the most, and repair hot...