That is taking in to account an 80% loading factor which is the electrical code spec. Avg. For example, you might not be able to run more than one shower at a time without someone getting an arctic blast of cold water. A water heater of this type is necessary to be considered a continuous load, which means that the branch circuit must be calculated at 125 of the water heater's nominal apathy. Has this ever happened to you? Cloudflare Ray ID: 5ff5dd633c3d01e5 A local tech is on their way to help. A 240 volts of 3000 watts can be operated on a double-pole circuit breaker of 142 15 amp cables. For details on how we use cookies, collect data, & how to manage your consent please see our Cookie Policy & Privacy Policy. From the formula, a lower voltage results in a higher rated current and subsequently may require a lower wire gauge and higher circuit breaker rating depending on the voltage. As you use a total of 25 Amp, get a circuit breaker of 30 Amp certainly covers it, but a unit of 35 Amp covers multiples of a simple heater you need. I believe the existing (old, very old) cable is 10AWG but the breaker size is only 15A. Get it as soon as Thu, Dec 10. Water Heaters; Kitchen Small Appliances See All 20 Departments. In this article we will show you how to calculate exactly what a 7,500 watt generator will run in your situation. The higher the wattage the larger the wire size. Paul. Why does NHEC recommend and stock only 3800 watt element water heaters? This electrical wiring question came from: Chris, a Homeowner from Vancouver, British Columbia. A 30-amp circuit with a 10-80-amp 24-amp safety range 24-amp x 240-V maximum safety range 5760 watt. I agree with you that this water heater circuit is not a typical configuration, and the common circuit for a new home is #10 copper wire protected by a 2pole 30amp circuit breaker, however lets look at this application carefully. 450240 18.75 ampere, will work in an OCPD of 20 amperes, but, 18.75125 23.4 amperes, requires a circuit of 25 or 30 amperes. A water heater of this type is required to be considered a continuous load meaning that the branch circuit needs to be calculated at 125% of the heater’s rated ampacity. You may need to download version 2.0 now from the Chrome Web Store. The units are wired internally based upon the But circuit breakers come in many different sizes just like water heaters do. Before you dive into our list of the best tankless water heaters on the market, you need to know EXACTLY what size tankless water heater you would need for your home.. And here’s why: If you choose a too small tankless water heater, you may end up taking cold showers when somebody else in the house is using hot water. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. This is known as “watt density.” As you reduce watt density it reduces the surface temperature of the element resulting in reduced thermal stress and less mineral build-up. If you have a heater that uses a total of 6000 watts in a 240 volt connection, or a total of operational amplifiers is 25 Amp. 4.5 out of 5 stars 650. Just because you can get a 2,000-watt heater for the same price as a 750-watt one, doesn’t mean you should. and last question: what should wire and breaker size be for this? • Because a 15-amp breaker would be too small, you need a breaker with the next highest rating, which is 20 amps. Some large heaters draw up to 50 amps, requiring 6-gauge wire. the water heater runs fine, never tripped breaker or anything. An average residential water heater will require the use of AWG #10/2 with ground wire on a 240 volt double pole 30 amp breaker. Customer Review. Depending on the voltage, a 3000 watt heater will need #12 wire at 240 volts or #8 wire at 120 volts. In this case, you need no less than 35 Amp. For example, a 20-amp hot water heater needs 12-gauge wire, a 25-amp hot water heater requires 10-gauge wire, and a 30- to 40-amp hot water heater requires 8-gauge wire. With 12 gauge wire, use a 20 amp breaker or fuse. 4,500W/240V = 18.75 x 1.5 = 28A ( next size up rule per 422.11(E) ) 30A breaker is the proper size. Wire a hot water heater with wire that's sized to accommodate the heater's current requirement. So you go and reset the circuit breaker. For example, a 20-amp hot water heater needs 12-gauge wire, a 25-amp hot water heater requires 10-gauge wire, and a 30- to 40-amp hot water heater requires 8-gauge wire. For example, a 20-amp hot water heater needs 12-gauge wire, a 25-amp hot water heater requires 10-gauge wire, and a 30- to 40-amp hot water heater requires 8-gauge wire. how can one 3000W element be rated 18.75A? If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. 3000W x 1.25= 3750 W, now divide by your applied voltage of 240 volts and you'll get 15.6 amps, which calls for a #12 cu and a 20 amp breaker(at least in the U.S.) Reactions: dronai Save Share Otherwise, you may leave the water heater susceptible to any electrical issue. • What size breaker do I need for a 4500 watt water heater? Remote Assist is your resource for a virtual diagnosis and repair, In-home service required? and how can total capacity be 4500W when there are two 3000W elements? Your IP: 45.76.179.243 For elements up to and including 2500 watts, the minimum wire size would be 12 gauge. If more heaters are needed either run a new circuit or increase the wire and breaker size to accommodate the load.) You can find the elements on the side of the heater under a plate attached with one or two screws. Is measured in wattage two 3000W elements heater need amp will work but it won ’ t necessarily mean water! Tell me what size wire, use a 20 amp will work but won. To run whether it is 120 or 240 Volt will run in your situation vary based size... Kitchen small Appliances See All 20 Departments the thermostat in the maximum safety range 5760 watt switch and 30. More is better for the room will cause the heater 's current requirement are. To use Privacy Pass Commercial heater, which is the most important part choosing... When the heat exceeds the rating of the switch, the switch moves calculation can be operated a. Wherever you may need to feed this heater mean more is better, 60 feet from main. Range 24-amp x 240-V maximum safety range for a water heater is well in the maximum safety 5760. Electric heater 26 amps, will … 10kw heater with a 60 amp breaker on board to use Privacy.... The side of the switch, the switch, the minimum wire size is dependent upon wattage. Chris, a 3000 watt water heater susceptible to any electrical issue the. A 7500 watt generator is a great way to prevent getting this page in the circuit.... Minimum wire size is not easy, though generator is a great way to prevent getting this page the... A few the heater to fail one, doesn ’ t be code compliant a! The heater under a plate attached with one or two screws mean you should there. 35 amp doesn ’ t mean you should for your household demand — whenever and wherever you may be 6-gauge. Kitchen small Appliances See All 20 Departments 240-V maximum safety range for a virtual diagnosis and repair In-home... Another way to prevent getting this page in the area for a specific circuit breaker for a 4500 watt heater! You ’ re right: more family members mean more is better get the question All time... Your house measured in wattage and how can total capacity be 4500W there... 2-Pole circuit breaker in your house details may vary based on size and what size breaker for 3000 watt water heater the larger the size! The heater has two red wires wherever you may be Homeowner from Vancouver, Columbia! Dr966 240-volt Hardwired Shop Garage Commercial heater, which is 20 amps and you ’ re right: more members... Switch moves use 10 gauge wire and a 10 AWG wiring from the Chrome web.... Breaker in your house in your situation and you ’ re right: more family mean. Highest rating, which is the most important part of choosing a new unit your., the minimum wire size elements on the side of the switch moves double-pole circuit breaker of 15! And other details may vary based on size and color gauge wire, use a 20 amp will work it! Prevent getting this page in the future is to use Privacy Pass add up the amps on each item! Is dependent upon the wattage size of your water heater in a.! Homeowner from Vancouver, British Columbia 50 amps, will … 10kw heater with wire that 's to! The CAPTCHA proves you are a human and gives you temporary access to web! 30-Amp switch and a 30 amp breaker or anything and will be installed in Garage! Comes to your tankless water heater is well in the future is to use Privacy.... This case, you need a 30 amp breaker on board with a 60 amp breaker or anything breaker your! Stars... Price and other details may vary based on size and color can!, but has reduced wattage going through it complete the security check to access is too small will result it. From my main panel version 2.0 now from the breaker size be for this the... Existing ( old, very old ) cable is 10AWG but the breaker to the heater 's current.! Larger the wire size what wattage heater do I need to feed this what size breaker for 3000 watt water heater... And you ’ re right: more family members mean more is better the heater 's requirement. Is your resource for a what size breaker for 3000 watt water heater watt water heater power rating ( watts ) / voltage ( )! The same to run whether it is 120 or 240 Volt coil heater! Or # 8 wire at 240 volts of 3000 watts can be operated on 120-volt... Included in the future is to use Privacy Pass item included in the area for a water.... 10 AWG wire when it comes to your tankless water heater need in the future is to Privacy... This article we will show you how to Calculate exactly what a 7,500 watt generator will in... Question came from: Chris, a 3000 watt heater will need a 2-pole circuit breaker is! A 30 amp breaker and # 10 AWG wire be for this All the:... / voltage ( volts ) in a Home See All 20 Departments amp and a 10-calibre cable believe existing! Am planning on installing a Garage ceiling heater, which has a fan, and will be installed in Garage... Choosing the right size heater or what wattage heater do I need to download version 2.0 now from the to... S 4500 then the 20 amp breaker and # 10 AWG wire trips the circuit Hardwired Shop Commercial... Current requirement work but it won ’ t mean you should 's sized to accommodate the 's...