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InvisibleballsalsaMDiscord
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Registered: 03/11/15
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Re: Straw bleach pasteurization? [Re: Gr0wer]
    #23780966 - 10/28/16 06:54 PM (7 years, 3 months ago)

Quote:

Gr0wer said:
Quote:

Quadman said:
I installed 2 tankless water heaters in series. It was for a dairy they needed wash water. The gas savings was substantial. The water was scalding hot. The first pre heated and the second brought it up to temp.




You should have just got a rennai with the commercial heater control, heats to 170-180F. Common craft brewing mod. And yes it will run you about $1400 installed. 

On the plastic vessel, I run a 1500w screw in element in my plastic drum, the key is that the element is submerged and dissipating the heat. But yes a SS tank would be best especially with larger elements.



and on the natural gas, 9/10 electric heat is cheaper for small DIY applications like this. For one i can rig a element to a vessel for less than $50 vs gas which can run in the hundreds just for your gas line to be ran, then another $100+- for the burner and stand. And unless you can enclose the flame around the vessel and more efficiently capture the heat 1/2 your heat goes up the exhaust stack or heats the room its in. Submerged heating elements are almost 100% efficient with converting the energy into water temp.




Rinnai is by far my preferred tankless heater.  I always try to talk my customers into a Rinnai, or at least a Takagi.  Noritz is garbage. Navien is also garbage. Eternal are actually pretty sweet. They used to have a problem with loud starts, but they fixed it by upsizing the exhaust. 
$1400 installed sounds unrealistic.  Those commercial Rinnai units cost about 900.    Depending on location (distance from the gas meter), whether you want the gas line exposed, or in the attic, or under the house, or buried. Whether you want steel pipe (black, scotchcoat, or galvi), or PE (if its underground), or Trac flex.  Its not unheard of for a tankless install to cost $3500 here in the L.A. area.  In fact, when people ask me to ballpark it without looking at it, i always use 3500 as the ballpark.  sometimes it can be done for 1400ish if the unit is close to the gas meter, and there is properly sized gas i can get at nearby, and i don't have to cut and patch a lot of big holes in the walls/ceilings.


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Offlinedrake89
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Re: Straw bleach pasteurization? [Re: ballsalsa]
    #23781088 - 10/28/16 07:50 PM (7 years, 3 months ago)

I concur that electric is great for diy and efficiency but the btus can't compare to gas


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OfflineQuadman
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Registered: 04/23/16
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Re: Straw bleach pasteurization? [Re: drake89]
    #23781344 - 10/28/16 09:33 PM (7 years, 3 months ago)

Yeah I spoke to my buddy they were Rinnai. He was dumping into uninsulated tank. To get the gpm and keep temp up he needed two units, otherwise water cooled too much. If you had a well insulated tank they would work slick and fast. I installed them for less than $180 labor. Nothing like a bargain.


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OfflineGr0wer
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Re: Straw bleach pasteurization? [Re: drake89]
    #23781382 - 10/28/16 09:49 PM (7 years, 3 months ago)

BTU's are great but capturing it can always be an issue. When you have a fancy boiler with fins and cross flow to capture 90% of the heat that's great but $$. With my 9kw brew rig i was heating 15 gal of water to strike temp in ~12 min, try that with gas.


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