Expansion Tank for Camp w/ 8 water heaters

[jeffcamp40]

Hello,

I am wondering how many expansion tanks I might need for a camp that I am on that has 8 water heaters that are all on the same water line coming from the city? They range from 30 to 50 gallon water heaters? Thanks for any help.

 

[Reach4]

One should be enough, but you will want a bigger one.

https://www.watts.com/resources/planning/etp is a calculator. You could plug in maybe a 350 gallon water heater.

So that would tend to give a rather worst case calculation. Worst case, all WHs get used to take lonh hot showers, and they all get shut off at once, and nobody flushes a toilet. That is going to be a rather rare occurrence. This calculator presumes a maximum design pressure of 130. Some are alarmed by that.

https://s3.amazonaws.com/s3.supplyhouse.com/manuals/1260456129163/20367_PROD_FILE.pdf has another take, rather than a calculator.