3 question's about a "tankless" water heater?

Question

1. How do you vent a tankless gas water heater. I dont want to go through my ceiling if I dont have to my house is 2 to 3 stories. I would rather run it out of my basement window or wall like a dryer vent.

2. If I bought an electric one how many volts or watts would my panel need to be able to handle?

3. Where is a good place to study the tankless water heater with pictures and so forth of its mechanics?

Answer 1

2. They are enormous instantaneous electricity hogs; just checking out one possible unit for my place, it used 3 separate circuits, each 240V 40 A, or if all 3 are on at once, 120 A, in this case 29 KW, around 100K Btu.

You can go smaller, but it's all about how many simultaneous things you need to feed.

Obviously that is either over or a big part of your standard panel capacity, if you have to factor in upgrading your electric service, there goes the cost.

Answer 2

You should be able to vent it out through the wall, but you will need speacial ducting(high temp)

Different units will draw different loads  go to the supply store and read the box, or find the unit on line.

Each one is slightly different find the one your interested in and contact the manufacturer