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-   -   Tankless Water Heater & Mash Temp (http://www.homebrewtalk.com/f13/tankless-water-heater-mash-temp-212354/)

Jknapp 12-17-2010 06:42 PM

Tankless Water Heater & Mash Temp
I'm getting a tankless water heater installed next week. The plumber says I can set the temp of water to whatever I want with the digital controller - max temp of 180. He's going to install a valve in my garage for when I brew -
I will be able to get mash-temp water on demand at my brew station, which will be cool.

Anyone else using tankless water heaters for their mash water? If so, how is it working out?

Randar 12-17-2010 06:47 PM

180!?!?!? Maybe if the flow is very low. Typical tankless heaters are installed and pre-set in the 110-125 range. I have a high volume Noritz because we have a very cold ground water in the winter and high flow shower that draws a heft 7+ gpm when going full-bore (although we usually set to about 2.5 gpm)...

BTW, the ratings and such are skewed because they are not typically tested on equal footings between manufacturers.

Jknapp 12-17-2010 07:10 PM

Here's the link to the unit:

The national sales rep in the video says the water can be adjusted from 100-180. So, your experience has been that the higher the temp, the lower the flow?

I want to make sure that this will work before taking the plunge. My plumber said it would heat to 180 with no problems.

samc 12-17-2010 07:26 PM

1. do you filter the water going into the heater? you might want to do that.

2. is your garage valve going to cut off the supply to the rest of the house? it should or someone might have a nasty shower surprise.

Randar 12-17-2010 07:49 PM

That's a pretty similar unit to the one I have, which works well in Chicago (my ground source water is currently 47 degrees, FYI). Here is the critical section in the specs:

"Turbo Flow - Up to 11.1 GPM @ 35 degree temperature rise (8.4 GPM @ 45 degree rise)."

So, what is the temp rise from your source water temps? To go from nominal 60 degrees to 180 is a 120 temp rise, so you aren't going to want to leave it set at 180 as your home default!

Don't let that keep you from getting one, IMO they're absolutely great.

Also, if you have municipal and/or treated water, you do NOT need a whole house filter on the source side. If you have a water softener and you might want one. But these things come with 10 yr full warranties (mine did through my installer who only does tankless) and I have had early Bosch models in my parents' home (2 of em) and they have been going strong with minimal service for 22 years now)

John Beere 12-17-2010 07:51 PM

You have to do something to override the defaults to get it to go up to 180.. I am unsure what that something is, but can find out from the guy who did it to mine if you need me too. I don't doubt it can output water up to 180.. They are a beast. I tried 145 just as a test and it handled it without any issue at full pressure..

Randar 12-17-2010 08:00 PM

John, do you have a Noritz? Mine has a digital input pad that allows me to enter the temp, but I never tried anything higher than 125....

John Beere 12-17-2010 10:37 PM

Yeah, it's a nortitz. A friend who works at a plumbing supply place in town is the one who did something on the control panel to override it to 180..

Randar 12-17-2010 11:00 PM

It's funny, but I brew very close to the tankless heater and it never occured to me to crank it temporarily and get much hotter water to star with in my HLT... heading to Home depot tonight to get some connectors to connect directly to my Hot output redirect valve.

Jknapp 12-17-2010 11:15 PM

Let us know how it does Randar..

I'd guess that my water coming in is around 50 degrees in the summer, so that would be a 130 degree temp rise to 180. I'll look into how it would handle that much of the swing.

The current tax rebate is a huge incentive, but to use it for mash water - now that is REALLY what's important..

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