Why hardwire and not plug?

[oracle]

Hi,
I have a tankless water heater 9.5 Amp/ 220v.
I asked the electrician and he insisted it has to be hard wired but couldn't tell me why?
What's wrong with using a plug to a 220v receptacle like the washer or dryer?

The reason I care is that I have to easily remove the heater during the winter days cause the garage is not heated.


Thanks
Gaspar

 

[mrb]

Hi,
I have a tankless water heater 9.5 Amp/ 220v.
I asked the electrician and he insisted it has to be hard wired but couldn't tell me why?
What's wrong with using a plug to a 220v receptacle like the washer or dryer?

The reason I care is that I have to easily remove the heater during the winter days cause the garage is not heated.


Thanks
Gaspar

probably has to do with the UL / CSA listing. If the unit is only listed for hardware, and not cord, then it has to be hardwired.

If you were to go ahead and put a cord on it, you would need to make sure the temperature rating of the cord meets the minimum temperature rating of the branch circuit conductors the heater requires (prob. 90deg c). You wouldnt use a dryer plug, you would use a NEMA 6-15 15amp 250v receptacle and plug.

 

[oracle]

I have scanned that part of the manual, I don't see anything about plug/receptacle..

What do you think?

Thanks

 

[mrb]

I dont see any 9.5 amp model listed in the table there. Is your heater model AE9.5 which needs 40 amps of 240?

 

[oracle]

Yes, it is the 9.5 Amp 240v.
Here's the manual just in case:
http://www.boschhotwater.com/Portals/7/TechManuals/AE3.4_7.2_9.5_English_08.2008.pdf

Or is this have to do with some sort of city code?

 

[Moto]

Uh, the AE9.5 240V needs 40 Amps. Not 9.5 amps.

 

[mrb]

instead of removing the heater, why not just T off a ball valve with an air fitting on it on the heater side of the supply shutoff, then you can use your compressor to blow the water out of it before winter.

 

[rieferman]

mrb wrote

instead of removing the heater, why not just T off a ball valve with an air fitting on it on the heater side of the supply shutoff, then you can use your compressor to blow the water out of it before winter.

+1

 

[kbs2244]

That drawing at the bottom of page 5 sure looks like a cord grommet.
But I would go with the "drain it for the winter" idea.

 

[Charles (in GA)]

Don't know about Canada. In the US, the NEC, 422.16(A) says that "the appliance is intended or identified for flexible cord connection." meaning that, if it doesn't specify a flexible cord in the instructions or on the unit, then you cannot use a flexible cord.

Charles

 

[mrb]

That drawing at the bottom of page 5 sure looks like a cord grommet.
But I would go with the "drain it for the winter" idea.

i think the grommet and clamp thing pictured is the heater side of the terminal block.