New Lochinvar Indirect Water Heater

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sizes also. I like seeing the 60 AND 75 gallon capacity offered.

Some of the longest lasting indirect I have installed were glass lined steel.

Vailliant had a nice one years ago. A huge handhole in the side made for excellennt cleaning and inspection.

Keep the anode rods healthy!

Looks a lot like the new BWs :)

hot rod

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Paul Rohrs

Lochinvar Website

I was poking around the Lochinvar website and it shows a new indirect water heater available.

Glass lined steel tank, pretty healthy sized coil for good DHW production and flow rates. 10 year warranty. I guess I would like to hear more about this glass-lined single wall HX coil. (It looks kind of like the coils used in AO Smiths Cyclone heater.)

I really like Lochinvar and am glad to see that with this new information, maybe they are replacing the old EMT series which was extremely affordable, but not quite what I was after. This looks pretty good but I have no idea as to price yet. I will be on the phone tomorrow with my new Lochinvar distributor.

Hats off to you for now Lochinvar.

Regards,

PR

Biggerstaffradiantsolutions.com

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bobbyg_2

Hi Paul and Hot Rod! I was thinking the same thing. I would like to know more about the glass-lined heat exchanger. I've had the literature here on my desk for two days to remind me to ask about this very thing here on the Wall.

Has there been a glass-lined heat exchanger before? If so, what is the track record?

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Isn't the Bock

indirect a glass lined tank and HX?

Buderus is also a steel tank, I believe.

Also doesn't HTP SuperStor offer a glass lined tank. The Defender or Pretender, something like that

hot rod

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Ike Gatlin

alkali borosilicate

There are a few manufacturers out there with glass-lined indirects.
The glasslining process is quite a detailed operation. Frit is applied to the metal surface at a 13 ml thickness; (that’s about 7 more mls thicker than the paint on a new car) after the surface has been shot blasted to white metal. The frit is classified as an alkali borosilicate. In the frit mixture are a couple of key additives- silicon dioxide helps the glass resist an acidic environment and aluminum oxide to control the expansion of the material.
After application of the frit, the next step is to dry the moisture from the mixture to create what is known as creating bisque.

After the coated surface is dried, the entire tank assembly is fired to 1540 degrees f. The actual time it is fired depends on the mass of the tank. The entire process results in a fired porcelain enamel glass lining with a uniform thickness of 10 mils. (Anybody want to guess why we start at 13 ml and reduce to 10 ml?)

Unfortunately (to my limited knowledge) nobody has figured out how to economically produce a glass lined double wall indirect.

Ike Gatlin

bobbyg_2

Hi Ike,
A guess would be the moisture that is taken out of the mixture when creating the bisque.

Do you do this process at your tank plant in Lebanon?

Ike Gatlin

we have...

a winner. When you remove the moisture from the frit... it shrinks.
We do this process here in Lebanon. I am attaching photos of the process. It actually is something not many people get to see.

photo 1 blasting the tank
photo 2 applying the frit
photo 3 drying to bisque
photo 4 firing to 1540 f

Ike

bobbyg_2

Hi again Ike,
BTW, I'm Bob, the guy you took to dinner with Paul Rohrs before the Knight boiler training.

The tank lining process is cool, but I'm more curious about the "glass-lined steel" heat exchanger coil?

Ike Gatlin

coil

I know who you are Bob. Still studying hard?

The heatexchanger in these tanks is basically the equivalent of a boiler tube. It is wrapped in a coil to provide more surface area exposure to the potable water. The picture in the Lochinvar literature is deceiving. The coils do not actually touch each other. There is space between them, much like a sprung/spring if you will. The inside of the tank and the coil is coated with the frit material, just like the photos I posted earlier. The boiler water side of the coil is not glass lined.

One of the nicer things about the large coil in the tank is reduced pressure drop. The 40 gallon pressure drop is only 1.3 fthead at 12 gpm. Lots of stainless steel indirects have a very high pressure drop. (We will have one too) That is the biggest benefit seen with this type of tank. But I caution you… make sure you don’t live in a state with a double wall requirement. These tanks are only available in single wall.

bobbyg_2

Chemistry this semester........it's kind of neat and kind of hard..... but yeah I'm still studying :-(

I like to run all of this real world stuff past my professor.

thanks for the information!

BTW, do you have any I&O material available for the cascading Knight boiler?