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Installing water heater

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14 minutes ago, sometimewoodworker said:

55555555555555555

you are sure?

 

80% Safe Maximum Rule..16 amp breakerx240=3840 watts..but the safe maximum is 3072 watts..avoiding heat for safety, efficiency, and risk of fire.  And if you are in a house in Chiang Mai, that thing will be on max most of the year.

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25 minutes ago, scubascuba3 said:

anyone know why a water heater would take longer to heat the water than usual? my previous 3500 watt heater did it pretty quick, this one pretty slowly, both Japanese and 5+ years old so I'd expect still to be good

How many amps is your circuit and what size is the wire?  

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14 minutes ago, moontang said:

if you are in a house in Chiang Mai, that thing will be on max most of the year.

If you use a water heater that low powered up there then you either like cold showers, have no money or no common sense.

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9 hours ago, moontang said:

How many amps is your circuit and what size is the wire?  

I don't know but i wouldn't be surprised if the wrong size wire was used

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11 hours ago, scubascuba3 said:

anyone know why a water heater would take longer to heat the water than usual? my previous 3500 watt heater did it pretty quick, this one pretty slowly, both Japanese and 5+ years old so I'd expect still to be good

 

Low supply voltage would cause this effect as well as the reasons noted by others. Heating effect follows the square of supply voltage so a small reduction in voltage leads toa much larger reduction in power.

 

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A while back I did this plot of heater power vs supply voltage.

 

Untitled-1.jpg.e569131a49bf57a02bce47db9

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Since someone has called me out that the above plot "looks linear" here's a plot right down to 0V.

Note that at 50% supply voltage the heater power is 25% of rated.

 

Heater.jpg

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9 hours ago, Crossy said:

A while back I did this plot of heater power vs supply voltage.

...there are times that make me think Crossy may have vested interests in numerous anonymous Automatic Voltage Regulator companies

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I had a 3500 watt Toshiba for 10 years that worked without fail.  I replaced it just because I thought 10 years was long enough and replaced it with a Hitachi 4500 watt unit.  Nice unit but it actually makes the water too hot, even at it's lowest setting.  I have very good water flow so that's not the issue.  I had to run a second cold water supply line into the shower hose to cool it off enough to be comfortable.

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If the OP or others are installing the multi point 8000 watt water heaters, they may consider the advice I received from Stiebel Elton:

For your question, the answer is in the red text

 

For 8000 watt multi point Stiebel Eltron

 

1) What size electric cable is best from the load center to each heater?     2.5mm or 4.0 mm or 6.0 mm

 // 10 mm is the best for 8000watt multipoint unit , If choose 6 mm is  ”just” ok

 

2) What size circuit breaker? // 40 amp

 

3) Should this breaker be a RCBO breaker or normal breaker? // RCBO breaker

 

 

Safety is my #1 concern. // Stiebel Eltron, too J

 

 

Further information you require, pls do let me know.

 

Best regards,

     Vivi

Buriram Isaan Stiebel Eltron Water Heater Installation.jpg

Expo Buriram Stiebel Eltron Water Heaters.jpg

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I have bought a Stiebel eltron 3500 w; an electrician installed it and it's ok 

what regular maintenance is there to do ? every year, by an electrician ? 

Thanks 

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10 minutes ago, Aforek said:

I have bought a Stiebel eltron 3500 w; an electrician installed it and it's ok 

what regular maintenance is there to do ? every year, by an electrician ? 

Thanks 

None that I am aware.  Do push the "Test" button once in a while and then re-set.  Some have suggested running vinegar through to remove lime scale.  It seems they either last for a while or they don't.

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Some have a removable, cleanable screen at the inlet.  Almost looks like a plug.

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2 minutes ago, moontang said:

Some have a removable, cleanable screen at the inlet.  Almost looks like a plug.

 

And others hide it as the inlet sealing washer so you have to take off the feed pipe to get at it.

 

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