Anyone ever have experience with an EEMAX tankless water heater. Looked at one the other day. UL Listed. The heating element is a BARE nichrome coil IN the water stream!! Available in voltages up to 277 single phase and 480/277 three phase as far as I know. Any thoughts about having bare energized conductors in domestic water piping??
jes, There shouldn't really be any problem with this type of system, as long as the whole Hot Water system is Earthed properly. There is also the Electrode-Boiler system, that uses the Electrical resistance of the water itself, to heat the water, this also uses bare, live "elements", in contact with the water. Hope this helps.
I'll agree with Paul — 1 megawatt+, 480V electrode boilers in industrial applications aren't that tough to find.
I don’t know if it's a requirement, but those I've come across in plants have used a dedicated secondary-unit substation with a medium-voltage-primary transformer.
I know this type of tankless heaters with nichrome coils are common in some countries. Does anybody know how the "power showers" which are rather popular in the UK and Germany works?
I had a look at EEMAX homepage and in my always humble opinion, it appears like a low-cost alternative but if UL has approved it, it can't be blatantly unsafe, can it?
(I looked at the models on the Norway site and noticed that for the 40 Amp heater a 25A breaker and 4mm2 (#12) cable is the recommended minimum. A bit tight, in my humble opinion)
Those units (I call them demand units because they just warm the water on demand) are very popular in Puerto Rico and other parts of the carribean where homes don't need heat and don't have hot water tanks as a rule. The most common unit is right in the shower head and cord & plug connected. It's just plugged into the outlet in the bathroom. BTW most of the bathroom outlets I've seen in that region are not GFCI protected. OSHA Professor Grizzy
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