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Old 02-22-2013, 02:29 PM   #1
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Default 180 degree tankless for commercial dishwasher

What should I use?

The problem: They currently have a lochinvar copper fin 740,000btu boiler cranking out 180 degree water and circulate it through the entire restaurant. This is bad for obvious reasons. They need 180 degree water for the dish washer only. That dish washer only pulls 3gpm or less and has it's own dedicated 3/4" hot water loop running from the boiler room to the dish washer roughly 150' away.


So I was thinking a tankless unit that could boost the temp from 140(minimum setting of boiler) to 180 would be ideal. The boiler could be turned down to 140 and that would save a ton on fuel and would be easier on the boiler. Currently they have had to replace the boiler every 5 years on the dot.

I guess the ideal thing would be to put the tankless right next to the dish washer as they have space on the wall. That would remove the need for recirc and the associated energy loss. My only concern there is the tankless getting splashed and sucking in grease/smoke/what ever as it's in a commercial kitchen.


What unit would you recommend?

Thanks.

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Old 02-22-2013, 02:38 PM   #2
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The Navian NP-240 can do 180F
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Old 02-22-2013, 02:44 PM   #3
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Seems pretty pricey for a 40 degree boost at 3gpm or less.
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Old 02-22-2013, 03:08 PM   #4
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They do make elctric booster heater just for that purpose, under the dishwasher..
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Old 02-22-2013, 03:15 PM   #5
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Yeah but at $0.12/kwa, they would be spending hundreds of $ a month just on that booster heater. The tankless would pay for it self in a year.

No one makes a 180 degree heater for like $800-$1000?
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Old 02-22-2013, 03:26 PM   #6
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Quote:
Originally Posted by Protech View Post
Yeah but at $0.12/kwa, they would be spending hundreds of $ a month just on that booster heater. The tankless would pay for it self in a year.

No one makes a 180 degree heater for like $800-$1000?
Ya got a poi t there.. I remmy a drawing where u can piped in serie after the 140 temps heater into a smaller heater set at 180 temps and piped to the DW with return pipe back to small heater.
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Old 02-22-2013, 03:45 PM   #7
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Do they want to change their set up for two water heaters? You could just offer them a tempering valve installation to temper all but the dishwasher.
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Old 02-22-2013, 03:46 PM   #8
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Quote:
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Do they want to change their set up for two water heaters? You could just offer them a tempering valve installation to temper all but the dishwasher.
That's on the table, but that still requires heating the boiler to 180 which is abd for it and not as efficient.
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Old 02-22-2013, 08:46 PM   #9
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Quote:
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Yeah but at $0.12/kwa, they would be spending hundreds of $ a month just on that booster heater. The tankless would pay for it self in a year.

No one makes a 180 degree heater for like $800-$1000?
So if electricy is $0.12/kwa, is gas free? Can we see your calculations for the hundreds a month?
Do you understand how the booster and dishwasher work together and just how much water @180 is needed and for what duration.
A simple booster by Hatco or the like , is the simplest and least expensive way out.
If you are saving them $$$$ on reducing wear and tear as well as fuel on the boiler side they won't notice the spike in electric costs.

I am normally the quiet guy in the back but , I really hate when people try to reinvent the wheel by adding corners to it.
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Old 02-22-2013, 08:49 PM   #10
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Quote:
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I am normally the quiet guy in the back but , I really hate when people try to reinvent the wheel by adding corners to it.
With enough corners you can make a wheel
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