65 gallon water heater for 28 units

[relliott]

Anyone ever see this type.
Plate says 327 gallon per hour recovery.

Will that be enough (units have spa tubs) ?

[Frank P. Newman]

I haven't personally seen one of these, but it appears to be a Rheem high-capacity commercial unit. To me it seems to be almost a "tankless" style heater and tank combination with recirculation pump. At 360,000 btu/hr. input it will heat a lot of water fast. According the the Rheem table it will raise 75 gallons of water 100 deg. in 5 minutes. By comparison, their residential tankless heater is only rated at 180,000 bth/hr and regular residential gas heaters are only 40-60,000 btu/hr. So, without trying to out-engineer the architect that likely selected the unit, I would probably not discredit it for that service.
http://74.6.239.67/search/cache?ei=U...icp=1&.intl=us

[Michael Roberson]

They may need a clipboard installed in the hall with the designated shower times for each unit.

[relliott]

Originally Posted by fnewman

I haven't personally seen one of these, but it appears to be a Rheem high-capacity commercial unit. To me it seems to be almost a "tankless" style heater and tank combination with recirculation pump. At 360,000 btu/hr. input it will heat a lot of water fast. According the the Rheem table it will raise 75 gallons of water 100 deg. in 5 minutes. By comparison, their residential tankless heater is only rated at 180,000 bth/hr and regular residential gas heaters are only 40-60,000 btu/hr. So, without trying to out-engineer the architect that likely selected the unit, I would probably not discredit it for that service.
http://74.6.239.67/search/cache?ei=U...icp=1&.intl=us

Thanks Frank

[relliott]

Originally Posted by mroberson

They may need a clipboard installed in the hall with the designated shower times for each unit.

Is that official wordage for my report.?

[mnahrgang]

Well, if you take the 327 Gallons per hour at its face value and do some simple math, you come up with a problem.

Lets say half of the 28 units all run their tub at the same time. At 5gpm (rough average spigot rate), times 14 units, times 5 minutes: you get 350gallons used. That leaves nothing for the tooth brushing, shaving, dishwashers, wash machines, etc. Now granted nobody runs a bath that is 100% hot valve only, but it's not difficult to visualize a potential issue.

[Michael Larson]

Mark,

Do you really brush your teeth with warm water?

That's a very high output unit.

Is it enough for 28 units? I don't know but assuming 1/2 filling the tub at the same time is a bit high unless they all work the same shift at the same place.

[rmaday]

Here's something for individual calcs...
http://www.consumerreports.org/cro/a...heaters-ov.htm

[relliott]

I am guessing it is fine but Suggested Plumber do sizing .

New rehab with 2002 unit.
Note serial number of 0202

[rmaday]

Thanks, Mike

**edited, LOL I didn't bother to fill out the form...

[Michael R. Boyett]

Turns out that one was Aussie only...I bet they have a US version though.

[relliott]

Originally Posted by mboyett

Turns out that one was Aussie only...I bet they have a US version though.

Does their water heat at a different rate

[rmaday]

Originally Posted by relliott

Does their water heat at a different rate

"You know what they call a Quarter Pounder in Amsterdam?"

"Royale w/ cheese."

...and do you know why that is?

[Michael Roberson]

"You know what they call a Quarter Pounder in Amsterdam?"

"Royale w/ cheese."

...and do you know why that is?

The Metric System!

Thats right the metric system....

[Michael R. Boyett]

OK, try this one.