I am installing a point of use Chronomite SR-20L/240 HTR 240-Volt 20-Amp SR Series Instant-Flow Low Flow Tankless Water Heater. https://www.amazon.com/Chronomite-SR-20L-240-HTR-Instant-Flow/dp/B001B1KGUQ
I have called the company and they tell me that I need two pole 240v, 20 or 30 amp breaker. They said that it is wired with two hot and one ground 10 gauge wire. This is a new install for a bathroom I am building in my garage. I am having a problems finding romex type wire that has two black (hot) wires or a black and a red (hot) wire and a ground wire. They told me if I used 10/3 wire with a ground to cap the neutral wire. I need about 35 feet of wire.
My concern is with my inspection and having the proper wiring colors for my hot wires. If I get 10/2 with a ground, I will have a hot,neutral and a ground, but the neutral will be white. Please advise what the name of the particular wiring I need is called…. that has a black,red and a ground wire. Thanks!
Best Answer
Interesting. In Canada the cable you need exists (2 conductor 12 or 10 AWG, red and black jackets, with bare ground), is commonly used to wire baseboard heaters at 240V and 20A, and can be found at any HomeDepot. The cable is even made in USA! See here for 12 AWG: https://www.homedepot.ca/en/home/p.electrical-cable--copper-electrical-wire-gauge-122---romex-simpull-nmd90-122-red---10m.1000108220.html; and here for 10AWG:https://www.homedepot.ca/en/home/p.electrical-cable--copper-electrical-wire-gauge-102---romex-simpull-nmd90-102-red---75m.1000108211.html
If you can't find it in the USA, then see Harper's taping solution in another answer.