Hot Water On Demand

Experienced athletes share their insights in answering this question:
Well if you buy a 220 system it will be 220 volts. All the bigger systems like for whole house will be 220.some smaller under sink models will be 110. There is no polarity since it is AC. If you find something that says polarity on a on demand water heater then somebody at the factory is smoking something. 110 has 3 wires. all tests need done with a multimeter on the AC setting.Black wire will be 110 volts AC, White wire is neutral and green wire is ground. 220 system also has 3 wires. Colors can vary a bit here but usually it goes like this. Red wire is 110 AC – Black wire is 110 AC and white wire is Neutral or ground.Test to ground they read 110 Volts AC test to each other they read 220 AC because they are out of Phase to each other.PLEASE note. Always get a certified electrician to work on these units. If you feel you are just as good as any electrician, please make sure you have a family member nearby with a phone that can dial 911. 110AC can kill you and 220 AC can kill you faster and deader.To know whether any particular unit is 110 or 220 we would have to have the model number to look it up. Some can be either and in this case the only way to know is to take the junction box apart. If it is just plugging into a regular wall outlet then it is 110. If it looks like a special plug or like a dryer plug then it is 220.Hope that helps. Have a great weekend.

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All electric tankless water heaters require a 240-volt circuit to operate efficiently.
Professionals recommend keeping your water heater set between 130 and 140 degrees Fahrenheit. Any higher or lower value could endanger you and your family. While raising the temperature can result in burns, lowering it below the recommended setting can also be hazardous.
No, it does not matter which wire goes to which heating element terminal in this case – electricity can flow in either direction.
Requirements for electric tankless water heaters:

Voltage — Many retailers sell units that will accommodate 110V, 120V, 208V, 220V, 240V, and 277V. Amperage — Different electric water heaters will have various requirements in amp draw.

Consequently, it is often required that a home have a 200 AMP, 208 to 240 volt electrical service to run an electric tankless water heater (smaller whole-house models suitable for warmer climate areas can often be installed on 100, 125, or 150 AMP electrical services).
We recommend setting the temperature anywhere within 120 to 140°F. However, you can set your water heater temperature between 130 to 140°F, especially for large water heaters used in hospitals and industrial settings. If you have children at home, set it to 120°F as this is safe to the majority of the population.
If you want hot water instantly, you`ll want to consider getting a recirculation pump installed. When you turn off a fixture, a recirculation pump pushes any unused hot water back into your tankless water heater. This process allows the water to be reheated, so no cold water runs out of your hot water fixtures.
They are designed for different voltages and different watt densities. The popular style today is a screw-in version, but a four bolt flange style is also very common. The traditional residential heating element is 4500 watts/240 volts.
1. The wiring of heating elements doesn`t require to distinguish positive and negative poles. The core heating element of electric heaters is resistance wire (normally nickel-chromium alloy – Ni80Cr20), which is a resistive element, so there is no distinction between positive and negative poles.
One way to tell if you have a line thermostat is to look at the wires. The main wires will be quite thick, 1.5 to 2 mm, like those plugged into a wall outlet or light switch. On the other hand, the wires of low voltage thermostats are very thin, like those of doorbells or telephone jacks.
Divide the wattage by the voltage to determine the current drawn by the heater. This works because watts divided by voltage equals current. For example, if the wattage is 2,000 watts and the household voltage is a nominal 120 volts, divide 2,000 by 120 to determine the current.
As we know that the same water heater rated for 240V can be operated on 120V. Keep in mind that you can`t operate a 120V water heater on 240V AC.
A tankless water heater requires 120 amps to run on average.

If your home is older, you`ll likely need a professional electrician to upgrade your system and increase the amount of amperage available in your home.

Electric water heaters require a 240-volt dedicated circuit, which serves only the water heater and no other appliances or devices. The circuit wiring typically includes a 30-amp double-pole breaker and 10-2 non-metallic (NM) or MC cable.
You want a water heater with a Flow Rate at 60–65 degrees Fahrenheit of at least 6.5 GPM. If the listed GPMs are less than 6.5, it may be too small for your home, and you won`t have enough hot water at peak use times.
The label on the water heater indicates what voltage the water heater requires. Most residential units are 220/240 volts (but some are 110/120 volts). Verify your water heater is getting the correct voltage. If it is not getting the required voltage, there are probably issues with your home`s electrical system.
One whole-house tankless water heater has four 7,000-watt elements, for a total electrical load of 28,000 watts. This load re- quires wire and a circuit breaker that will handle at least 120 amps, at a cost many times that of electrical service to a conventional tank water heater.
Electric water heaters require a 240-volt dedicated circuit, which serves only the water heater and no other appliances or devices. The circuit wiring typically includes a 30-amp double-pole breaker and 10-2 non-metallic (NM) or MC cable.
The standard amperage of an electric water heater is 18.75 amps at 240 volts. The average electric heater comes with a wattage rating of 4500 watts, although this figure may differ from one model to another.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Coleman hot water on demand
ANSWER : Does anyone have a AC charger for the Hot Water Heater on Demand? I would be willing to buy one.
Thanks,
llhancock

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What is the polarity and voltage setting for the hot water on demand system
ANSWER : Well if you buy a 220 system it will be 220 volts. All the bigger systems like for whole house will be 220.some smaller under sink models will be 110. There is no polarity since it is AC. If you find something that says polarity on a on demand water heater then somebody at the factory is smoking something. 110 has 3 wires. all tests need done with a multimeter on the AC setting.Black wire will be 110 volts AC, White wire is neutral and green wire is ground. 220 system also has 3 wires. Colors can vary a bit here but usually it goes like this. Red wire is 110 AC – Black wire is 110 AC and white wire is Neutral or ground.Test to ground they read 110 Volts AC test to each other they read 220 AC because they are out of Phase to each other.PLEASE note. Always get a certified electrician to work on these units. If you feel you are just as good as any electrician, please make sure you have a family member nearby with a phone that can dial 911. 110AC can kill you and 220 AC can kill you faster and deader.To know whether any particular unit is 110 or 220 we would have to have the model number to look it up. Some can be either and in this case the only way to know is to take the junction box apart. If it is just plugging into a regular wall outlet then it is 110. If it looks like a special plug or like a dryer plug then it is 220.Hope that helps. Have a great weekend.

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Water system in my Coleman pop up not working
ANSWER : There is a 3 port valve conneted to the incomming water line (white usually). It is actually a check valve to keep the outside water from overfilling your tank. Verify it is installed correctly.

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I have a volvo penta md7a marine diesel engine fitted in my sailing boat. Recently, I changed the bottom sea **** which was almost blocked. Apparently the new sea **** is working well as it should. But this week with no apparent reason and without use of engine, I noticed that the cooling system water cup (the recipient which connects with the sea **** hose and the water pump hose) is empty and it Im not able to keep it full like it was before.The water vanishes every time I tried to fill it up in order to keep the water running throught the system. However the waterpump seems to be working. But almost no water is coming out of the exhaustor, of course, just a few drops once in a while. What might be going on ?? Thanks.
ANSWER : I don’t have a picture of the installation, but I can imagine a water filter above the water line with an improperly fitted cover and an air leak that lets the seawater drain out – losing the prime. Old Swampy in New Hampshire

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Hi i have a Coleman hot water on demand and the water wont heat up past luke warm, help needed please
ANSWER : Need to restrict the water input so it does not flow through so fast

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I have Detroit 60 series installed on a launch. Recently the Starboard unit suffers a catastrophic failure and piston No2 came out of the block, making a big hole. This engines are using heat exchangers, and sea water cooled Charge Air Coolers and sea water self priming raw water pump. We contact the local dealer an the veredict was a “Massive salt water ingestion” that caused an Hydraulic lock and damaged cyls 6 and 2. They say that the water came from the deck covers, but there is no way for that to happen, I think they dont want to honor any warranty, because we suspect that the water came from the Charge Air Cooler. I want to know if the CAC can cause that type of failures and if anyone had a similar problem. The engine cost is about 66K and only had 2300 hours.
ANSWER : I would have to say that a sleeve got pitted or lost an oring or the CAC sprung a leak. I believe you are correct in your assumption that the water did not enter the unit in the manner they are saying. The only real way to tell is a complete tear down and someone is going to have to pay. They are also a high maintenance item and someone is going to say that the preventive maintenance was not done.

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What is the pumping rate (volume) of the Coleman Hot Water on Demand water pump?
ANSWER : I recall 3 and a half liters per minute. More than the Primus and the Cube

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