I am overseas in Iraq for the second time and have a question.I am calculating the load for a barracks for the Iraqi army and have 4-45 kw water heaters,they are storage units not the instant heat type.What do I calculate for these as far as load.Do I do them all at 100% or is there a demand on these.I have looked in the code book but am unable to pin this down.I am unsure if I use some or all at 125%???If someone can help me on this and give a code article to support it as I have been out of this end of the trade for a while..Thanks
Electrical superintendent
- Thread starter CAPTMIKE
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Is this a feeder calculation?
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SUPT IN iRAQ
SUPT IN iRAQ
Yes This Actually For A Feeder,everything Here Is Poorly Designed At Best And I Am Redoing A Lot That Has Been Done.these Water Heaters Are,probably Going To Be Busy Especially In The Winter As It Gets Very Cold Here And Stays That Way For Quite A Time,so I Would Figure They Would Go At Least 100%. Looking For An Educated Opinion On That..thanks
SUPT IN iRAQ
Yes This Actually For A Feeder,everything Here Is Poorly Designed At Best And I Am Redoing A Lot That Has Been Done.these Water Heaters Are,probably Going To Be Busy Especially In The Winter As It Gets Very Cold Here And Stays That Way For Quite A Time,so I Would Figure They Would Go At Least 100%. Looking For An Educated Opinion On That..thanks
LawnGuyLandSparky
Senior Member
Definately go 100%. If you find you need more hot water, but lack the power to supply additional heater circuits, there is a fix.
You can replace the lower t-stat in an electric water heater with an upper t-stat, which is basically a 3-way switch. Once the heater has completed heating, the t-stat doesn't just turn the element off, it also turns a 3rd terminal on. This can be used to supply the next water heater downstream.
This way you can connect 2-3 water heaters to a 30a circuit.
You can replace the lower t-stat in an electric water heater with an upper t-stat, which is basically a 3-way switch. Once the heater has completed heating, the t-stat doesn't just turn the element off, it also turns a 3rd terminal on. This can be used to supply the next water heater downstream.
This way you can connect 2-3 water heaters to a 30a circuit.
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