Question about Bosch PowerStar AE125 AE125 Whole House Electric Tankless Water Heater...
Do i need two seperate wires ae two seperate 8-3 wires
You need three #8 wires for AE125. Two #8 wires for AE115.
1) Copy following link for wiring information:http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html
2) The AE125 has 3 elements, and requires 3 wires.Each wire is sized #8 copper, and is connected to 40 amp breaker, up to 100 feet. Over 100 feet, use 50 amp breaker and #6 wire. Oversizing breaker and wire is smarted and more efficient than undersizing.
3) Often a separate subpanel is installed to provide 3 extra spaces.
4) Makes sure main breaker panel can accept additional 120 amps of draw without overampping panel ... and starving other appliances of full power.... that will damage appliances, overheat motors, and damage main panel and overheat main breaker. You want to oversize, not undersize electric service when installing tankless electric, which is why I do not recommend tankless electric installation, including issues of costing more to operate, and expensive repairs, and general money risk-nuisance of owning tankless vrs tank-type heater.
Posted on Dec 06, 2012
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Posted on Jan 02, 2017
My experience in Germany with tankless water heaters was not good; the delivery promised was only vaguely warmed water; they are no replacement for standard devices.
If you can find closet or under-counter (in the kitchen) space you might look into the 20 gallon units made for RVs or small mobile homes/campers. They are not expensive to run and cost well below the ~ $400 US price I saw when looking at the Bosch. If you are worried about the efficiency of them or concerned with the cost of electricity in your area, you could have an electrician install a high-capacity (15-20 Amp) toggle switch (looks like a normal light switch) and manually turn it off completely when it is unused for a longer period of time.
In any case, before you jump on the Bosch bandwagon, check the degree (or lack) of satisfaction from current owners:
I wouldn't be encouraged to buy that one.
Posted on Sep 18, 2008
According to the user manual below, it's a 50 amp heater, therefore, you need 6 AWG electrical cable and a 50 amp double pole (220 volt) breaker in the main service panel.
You need two hot wires and a ground wire. The cable would be specified as 6/2 w/ ground. The 2 hot wires in the cable would be red & black or black & black -- these attach to L1 & L2 respectively. ( L = Line )
More info, let me know.
Posted on Oct 04, 2009
Before calling service technician, open following links for Bosch error codes, and contact information, and possible product manual for your model, etc:
Error code AE is not shown, but error EA means "burner flame not recognized by control unit when water is flowing"
There is also error A3 and A3 E3: jumper connection is not correct
Posted on Sep 26, 2011
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