One Friday morning I heard screaming from my neighbour Mike’s home. I aksed him the ‘what happened?’
‘I just lost my expensive tankless water heater for short circuit’, He replied.
‘Didnt you have a breaker for your tankless water heater, I said.
‘ I didn’t use that, What size breaker do I need for a tankless water heater?, he said.
So, this a common question not only for Mike but also many people around the country.
Let’s dig out the answer of this.
What is breaker?
Circuit breaker or breaker is an important device to protect an electrical circuit from damage done by excess current from a short circuit or overload. This tool interrupt electricity flow if a fault is detected.
Does a tankless water heater require a dedicated circuit?
YES. A tankless water heater requires a circuit that is instructed in the installation manual of a specific unit. Typically, a circuit has to be some brand as per the unit manufacturer. But, if you need additional space inside the panel of your unit, then you may be allowed to get a quad circuit breaker.
What size breaker do I need for a tankless water heater?
Topically, a tankless water heater need 40-50 amp for each of wire. we have to learn more information about this. Let’s get the details.
Things to consider before buying breaker for a tankless water heater:
- Your main panel and breaker band should be the same.
- Find volt and watt on the side label of tankless water heater. To calculate amp divide watt by volt.
- For learning about wiring you should look at the product manual. You can find over there that, 3*50 means three 50 amp breakers or 2*40 means two 40 amp breakers.
- Each breaker provides power to one element and every element has two terminal. Be careful not to supply power by splitting wire from breaker to more than one element.
- If you look at the screw terminal inside the unit, you will learn about how many wires is required. Say for example two terminals mean 1 wire, 4 terminal s means 2 wire, and so on.
Following information applies for 208 to 240 volt single phase voltage:
greater than 7.7 Kw= 7600 watts / 40 amp breaker/ 8 gauge wire
greater than 9.6 Kw = 9600 watts/ 50 amp breaker/ 6 gauge wire
greater than 11.5 Kw = 11500 watts/ 60 amp breaker/ 6 gauge wire
greater than 13.4 Kw = 13400 watts/ 70 amp breaker/ 4 gauge wire
what size breaker do I need for a 220 volt water heater?
This capacity heater flow continuous load. So, the branch circuits required to be calculated at 125 percentage heaters rated ampacity.
For a 20 amp OCPD, it’s require 4500/240=18.75 amps. One the other hand 18.75*125% requires for a 25-30 amp circuit.
What size breaker do I need for a 240 volt water heater?
5500 watts at 240 volts is a resistive load. For this the breaker size should be 30 amps.
People also asked
Q. Does a tankless water heater need a dedicated circuit?
Ans. YES. Typically, a units installation manual states a specific dedicated breaker for selected tankless water heater.
Q. How many amps do you need for a tankless water heater?
Ans: On an average a households total capacity is 200 amp, but a tankless water heater require minimum 120 amp to operate.
Q. What size breaker do I need for a 110 water heater?
Ans: Electric water heater require 240 volts dedicated circuit breaker. The circuit breaker serves only the tankless water heater.
Q. What voltage does a tankless water heater use?
Ans: Typically, a tankless water heater use 120 volts, 60 Hz and less than three amp.
Q. How many watts does an electric tankless water heater use?
Ans: To handle total 28,000 watts loads, a whole house tankless water heater has four 7,000 watts elements.
Q. What wire do I use for a 30 amp breaker?
Ans: Typically, 10 gauge wire is a good choice for 30 amp breaker.
Q. What can I run off a 30 amp breaker?
Ans: In USA electric supply system 30 amp breakers are designed for single appliances like electric dryer, electric oven, electric range, small or medium ranges A/C unit, electric arc welder, small electric water heater, small hot tub, level two car charger etc.
Q. Is a double pole 30 amp breaker 60 amps?
Ans: Typically, a double pole breaker related for 20 to 60 amp as well as supply 240 volts for large appliances.
Q. How much can you run off a 30 amp breaker?
Ans: A 30 amp breaker uses 120 volts.
Q. How many outlets can be on a 30 amp breaker?
Ans: You can put on one outlet on a 30 amp breaker.
Q. How many amps is 240 volts?
Ans: We know amps=watts/volts
So, now we can calculate:
3600 Watts / 240 Volts = 15 Amps
Q. What is a double pole 30 amp breaker used for?
Ans: Double pole 30 amp breaker is used for two seperate 120 volts circuits or one 240 volts circuits. Say for example, central AC,s unit is a 240 volts circuit.
Q. Can I replace a 30 amp breaker with a 60 amp breaker?
Ans: You must not overcurrent protection on your wiring. Typically, 10 gauge wire is suitable for a 30 amp circuit. If you have breaker occupied one slut, that is 120 volts, Your unit requires 240 volts.
Q Can a 60 amp breaker feed a 100 amp sub panel?
Ans: NO. Typically, ‘100 amp’ rating means maximum rating that you can feed it.
60 amp breaker
Q. How many 240v outlets can you put on one circuit?
Ans: You can put as many 120 volts or 240 volts outlets as you want on one circuit. There is no limit.
Q. How many outlets can I run on a 20 amp breaker?
Ans: Typically, the rule is maximum 1.5 amp for each receptacle. This calculation allow you to set 10 outlets on a 20 amp breaker.
Q. How many outlets can be on a 15 amp breaker?
Ans: it’s 8 to 10 outlets for 15 amp breaker.
Q. What does a double 100 amp breaker mean?
Ans: If you mean the breaker has two handles tied together each one says 100 amp, it’s a 100 amp service. On the other hand, if you find four handles breaker, that’s mean most likely a 200 amp service.
Q. Can you use a single pole breaker for 220?
Ans: Current code doesn’t allow to use single pole of 120 volt breaker for getting 220 volts.
Q. Can I split a double pole breaker?
Ans: NO. The breaker must be able to trip before the wire connected to it.
Q. How many amps can a 60 amp breaker handle?
Ans: A 60 amp breaker can handle 240 amps
Q. Can I put a 30 amp breaker in place of a 20 amp breaker?
Ans: No. You should not put a 30 amp breaker in place of a 20 amp breaker. Typically, it could rise the overload problem as the wiring would be most probably sizing for 20 amps.
Q. Can you run multiple 220v outlets one breaker?
Ans: YES. You can use two 220 volts outlets off of single circuit breaker. To do that you must not exceed the amps rating of the breaker.
Q. What size breaker do I need for a 220v tanning bed?
Ans: you will need a 20 amp circuit breaker.
Q. Can I use 14 gauge wire on a 20 amp breaker?
Ans: NO, you cannot use 14 American wire gauge (awg) on anywhere which has 20A breaker.
Q. Can I replace a 20 amp breaker with a 15 amp breaker?
Ans: Technically it’s possible. But, it is not advisable to replace a 20 amp breaker with in a 15 amp breaker.
Q. Can you put a 200 amp main breaker in a 100 amp panel?
Ans: NO, you cannot put a 200 amp main breaker in a 100 amp panel.
Q. Can you run 2 wires one breaker?
Ans: If your circuit breaker designed to run 2 wires on one breaker, then you can run 2 wires one breaker.
Q. Do I need a single or double pole breaker?
Ans: it depends on your requirements. Typically, a single-pole breaker is used with a 120 volts circuit and a 15-20 amp. On the other hand double breaker use with 240 volts circuit and 20-60 amp.
Q. Can I put a bigger breaker in my box?
Ans: If you want to do that for increasing the capacity of circuit,then you have to replace wire with adequate gauge.
Hopefully, you have gotten the answer of What size breaker do I need for a tankless water heater. If you think you need further assistance or consultancy, contact with Austin’s best plumbing company plumberson.