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-   -   Tankless water heater for fly sparging? (http://www.homebrewtalk.com/f51/tankless-water-heater-fly-sparging-182041/)

WoweeZowee 06-11-2010 08:57 PM

Tankless water heater for fly sparging?
I was just browsing around the internet for LP gas tankless water heaters, and I stumbled upon a fairly cheap model. Does anyone have experience with this kind of water heater? Could it be easily modified for lower flow-rate and higher temp? I would really like to have on-demand sparge water for my new propane fired stand.

Walker 06-11-2010 09:04 PM

No experience with it, but if it can be attached to a hose, then you can control the flow rate with a ball-valve.

One thing I wonder is if it is going to be able to get the temps you want. It might have built-in safety measures to prevent the water from getting too hot. Most hosehold water heaters don't heat hotter than 120*F or so, and I suspect this thing might be the same.

Getting it to put out 170*F water might not be possible.

RegionalChaos 06-11-2010 09:08 PM

The site says: Adjustable water temp from 80-150

Would be nice if it could hit 170 or so. I love the tankless instant hot water heater ideas, and am always looking out for them too..

RegionalChaos 06-11-2010 09:10 PM

flow rate drops with temp raises, but the chart they list for it doesn't make sense to me.

WoweeZowee 06-11-2010 09:11 PM

The manufacturers specs say that it needs 1.3 gal/per minute to activate, so I don't know if a ball valve alone is enough to regulate flow. Its highest rated water temp is 150*F. It doesn't seem like too far of a stretch to ask for 165*F.

I suppose the delivery rate issue could be fixed by placing a grant and float switch after the output of the heater. Any ideas on modifying it for slightly higher temps?

WoweeZowee 06-11-2010 09:28 PM

Hmmm, I also see in the manual that there is a 20 minute safety shut off delay. It would be much more useful to find some technical drawings on this model - or just this type of tankless water heater.

Sawdustguy 06-11-2010 10:02 PM

I don't think this particular tankless hot water heater will do it for you. The Takagi Flash T-K3-SP-LP Whole House, Liquid Propane at about $850 will handle the job.


Takagi T-K3 Tankless Hot Water Heater will give you a max output of 6.9 GPM. A 50-degree water input and a 55-degree temperature rise will give you about 6 GPM. This is enough for two standard showers (2.5 gpm each). The Takagi T-K3 can also be used for heating applications up to 180 degrees.
You can get a 120* temperature rise at 2.5 gpm


kladue 06-11-2010 10:13 PM

Likely the unit control board is not user adjustable to reach the Strike and sparge temperatures you want. The units built for hydronic heating seem to allow for temperatures up to 170 but that seems to be the limit. It does not look like this would be a simple controls tweak to get a strike and sparge water heating system for a brewing system from one of the instant water heaters. GreenMonti's flash boiler looks like the gas burning candidate for both purposes but it is not an off the shelf device unless you could talk him into building one.

Jian143 07-02-2010 03:35 PM

Go with the T-K3-SP-LP!
I agree with Sawdustguy. I purchased Takagi's T-K3-SP-LP and was very satisfied with my purchase. The oneclickdirect.com website had it priced at $851 but I found a coupon code on some random coupon website for 5% off your whole purchase and it was free shipping. I think it was retailmenot.com or something like that. It would totally work for fly sparging.

david_42 07-02-2010 05:56 PM

I do know one brewery that uses a couple tankless heaters in series, but the controls are locked out.

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