tankless electric water heaters

Mark White

hi folks can anyone tell if they have had positive experiences with atankless hot water heater elec. as far as performance and payback //? thanks mark white

jeff_51

haven't used any in a long timebut

NO

Scott Gregg

Electric Tankless

I have dealt with a couple and done a lot of homework on them. I'll boil it down so I don't put you asleep.

It takes a 120AMP unit to provide adequate hot water flow rates in most areas unless you are in a warm climate.

Expect the best flow rate at a reasonable temperature rise to be 4 GPM and not much greater.

This is enough for two showers at the same time. In the winter you probably will get less.

Saving will be something like 30-50% of a standard electric tank.

If you can (and you probably can) you are better off going to an LP tankless heater. You will get a lot better performance and greater energy savings over the electric tank heater. Stick with the units that max a max input of like 190,000+BTUs.

jp_2

why would you save 30-50% from one electric heating element to another, I have a hard time believing this. I doubt the tank losses are that high.

you need to heat those elements much higher than in a normal WH, I would think the only benefit is not running out of hot water.
please provide some data here?

Michal_2

engineering standpoint

as an engineer, i have spec'd and seen many of these units in place. I have personally serviced and installed them as well. The new ones are excellent in performance, but you size them to do individual loads, as mentioned before. one heater can do a shower safely and with minimal power consumption, look at eemax heaters. WWW.eemax.com, They are field serviceable. Depending on voltage, will depend on cost, you need to determine what voltage, this will dictate the amperage pull. There is no loss in efficiency, as electric heaters are extremely effificent almost 100% but they are expensive to run, depending where you are. there are no stand by losses, since it shuts off when there is no flow. check ou tthe site, you will get a good idea

Larry Weingarten

Energy Factor...

for electric tank type heaters is usually up in the 90s. That's 90% efficient + or -. How is it possible to get another 30%?
Yours, Larry

DrV

tankless electric water heaters please help

If you install a GFX Power Booster, you can take two showers with a 60-Amp (15-kW) tankless heater. Without a drain-power booster, you may need up to 120-Amps as Scott D. Plumber suggests -- if your city water temp falls below 45F and your combind shower-flow rate approaches 4.5 gpm.