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Board wash/water heater

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Board wash/water heater | 11 February, 2013

I'm working on installing a batch washer, and am looking into water heaters to support the cleaning process.

I'll be installing a DI system, and I know that stainless steel tanks are needed due to the corrosive nature of DI water.

My DI system installers recommended a tankless/on-demand system to support my needs. The only issue I'm having now is finding an electric tankless system that can handle 140 degree plus water.

Anyone have any suggestions for this type of a tankless water heater?

If not, anyone have any suggestions for a stainless steel hot water heater? I've been digging through specs, but, sometimes the tank material is listed, and sometimes it isn't.

Thanks, ..rob

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Tankless Water Heater Deionized | 12 February, 2013

Google => tankless water heater deionized

BR, davef

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Tankless Water Heater Deionized | 13 February, 2013

Thanks, Dave.

One thing that's beginning to concern me about the tankless heaters is their capabilities to get the water to the right temperature, at the right flow rate.

It would be too easy to know the actual flow rate of the wash machine I bought, but, I'm guesstimating it between 3-7 gpm (pretty average estimate for dish washers, so, I'm applying it to a batch washer). With inlet temps between 60 and 65 degrees, to get the 140-150 degree temps that I want for cleaning water soluble fluxes, I'm looking at 80 degree plus temp rises. I've found some tankless units out there that can handle 80+ degree rises at 5gpm, but, they're looking like they're in the 30,000W 120-160A range. I'm not sure that the potential energy savings of an on-demand system balance out that kind of energy consumption when it is being used. Never mind the facilities prep I'll need to accomplish before I install it.

I've discovered that the tank-heater that I was using at my previous company has a ceramic coated tank. I know that stainless steel is recommended for DI systems; but, I also know that that tank is going on 8 years of health. If I can get 5-10 years out of a low cost heater option, I think that that will be the route to go at this point.


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Tankless ... Nice Idea But I Wonder Too | 14 February, 2013

Yeh, I love the idea of tankless, but ...

Tell ya what, when I'm at IPC APEX next week, I'll poke around on using tankless in a mid-to-low volume plant.

BR, davef

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Tankless ... What I Took Away | 22 February, 2013

First, it's not a simple as thinking just about your electric meter. * Water heaters need to be DI proof, stainless or ceramic. * The longer that DI water is exposed to air, then closer it becomes like tap water. So, you need to be monitoring DI levels out of the water heater tank as well as out the beds. * DI tanks need to be in-front of the water heater because hot water kills resin beds * High temperature water DI beds are very expensive.

On to the electric bill. * Amount of electric energy that it takes to raise water 70*F is the same, regardless if it's doing its work in a tank heater or a tankless heater. * Tank heaters use energy constantly keeping water at the set temperature in addition to raising it to that temperature.

BR, davef

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Board wash/water heater | 26 March, 2013

Hi robgd3, your DI system installer is right in his recommendation for a tankless/on-demand system. You know what? We are in the same situation six months ago and all my concerns were met when I installed this tankless water heater.

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