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Old July 26th, 2007, 05:50 PM   #1
Miffy
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on demand hot water

Ok I know there is one of you guys out there that know about these things.
I am going to get this for my house, who can tell me the best product for the best price out there?

One of the problums in my house right now is my hot water tank is on one end of the house and it takes 3 to 4 min. for it to get to the kitchen at the other end.

Please share...
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Old July 26th, 2007, 05:54 PM   #2
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You need to find a man to do this for you.:tonka:
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Old July 26th, 2007, 05:54 PM   #3
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bosch. get the biggest one you can afford
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Old July 26th, 2007, 05:59 PM   #4
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We had one of the "instant" hot water things and couldn't get it to work correctly... went back to the good 'ol water heater.

Might have just been a fluke though... not sure.
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Old July 26th, 2007, 05:59 PM   #5
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Quote:
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bosch. get the biggest one you can afford
X2
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Old July 26th, 2007, 06:00 PM   #6
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unless you're talking about one of those hot water taps that you put in your sink... those things are great!
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Old July 26th, 2007, 06:04 PM   #7
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I am not a plumber nor know a lot about hot water heaters, but I would have to think that getting an on demand water heater would not solve the 3-4 minute lag for hot water to get from one end of the house to the other. It seems like the hot water tank has hot water available, but it just takes a while it to get there. I would guess the only difference is that the on demand does not store hot water but heats it as it pass thru and the tank you would constantly be storing hot water. I just do not see it helping speed up hot water delivery.
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Old July 26th, 2007, 06:04 PM   #8
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i am a hvac installer by trade and i have installed these before, i believe the brand we installed is RINNAI... and you would definately need someone qualified to install one.... but they are sweet! but the guy above me may be correct in saying that it may not solve your problem... there is an alternative though... its kind of like a recirculation pump.... you should probably talk to a plumber about it though... basically it recirculates the hot water throught the pipes when your not using it to keep it hot in the line at all times...

Last edited by TJ SKWIG; July 26th, 2007 at 06:09 PM.
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Old July 26th, 2007, 06:19 PM   #9
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Dunno what you guys are talking about, but I've seen 2 units installed and they pretty much had a little reservoir like a water fountain for the initial water coming out of the tap and were plenty hot enough to keep it hot after a few seconds. No lag whatsoever.
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Old July 26th, 2007, 06:26 PM   #10
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Don't get it thought Home Depot get it from are real plumbing warehouse or you be sorry
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Old July 26th, 2007, 06:27 PM   #11
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Quote:
Originally Posted by TJ SKWIGhoo.com View Post
its kind of like a recirculation pump.... you should probably talk to a plumber about it though... basically it recirculates the hot water throught the pipes when your not using it to keep it hot in the line at all times...
It's not kind of like a re-circ pump, it is a re-circ pump, they work great from what I've seen, it's just a pump that constantly circulates the hot water until it is needed.
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Old July 26th, 2007, 06:34 PM   #12
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My sister and her husband had two tankless put in their house. They suck. You have to wait at least a minute for warm water in the shower. The dishwasher depends on hot water to operate, it does a shitty job with a tankless. You just need to run a return loop from your furthest fixture, back to the drain valve on your hot water tank. That will solve the lag. There is a thing you can get from the building supply that will make it work a little better. My Dad has one, he likes it. Or you can put a little circulating pump on your return line. If you run your hot supply lines with some "grade" (run them slightly uphill to your fixtures), and grade the return line downhill back to the tank, it will circulate by thermosyphon. I am not a plumber, but I worked as one for two years in Saginaw, and I know every thing about everything.


http://www.rewci.com/whhohotwaci.html


http://www.chilipepperapp.com/tscs.htm

Last edited by special ed; July 26th, 2007 at 06:38 PM.
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Old July 26th, 2007, 06:39 PM   #13
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I think there are a couple different types. Some replace your water heater and would go in that location. To solve the lag proble you would need one of the re-circ ones. There is another type that you put right at the sink or shower. This way the source of the hot water is right next to where you are using it so there is no travel time from one end of the house to the other, no lag.
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Old July 26th, 2007, 07:31 PM   #14
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These things suck - we have one for our cabin and the water temperature cannot stay consistent... You will be taking a nice warm shower and then bam scolding hot water, or even worse ice cold water.

I would not get one of these units again.
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Old July 26th, 2007, 07:43 PM   #15
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the problem is most people dont get one big enough. a normal family needs at least 200K btu. I helped a friend put one in his house and it works fine. Installed easy too.
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Old July 26th, 2007, 07:44 PM   #16
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Three of the better names, Bosch, Renni (sp), Norits.

My inlaws have a Norits. It has the most output, I think it is 8 gpm. They can run 4 showers and then some at one time.

DO NOT get a Home Depot unit. They work for shit.
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Old July 26th, 2007, 07:54 PM   #17
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Just to be clear, Sue, do you mean an Instant-hot for the kitchen, or a tankless whole-house water heater?

I'm guessing you want an instant-hot for your kitchen. They are sweet, my parents-in-law swear by theirs, but I don't know what brand it is...
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Old July 26th, 2007, 07:55 PM   #18
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We had one when they first came out 20 years ago. Running it on well water sucked big time. Every time the water pressure would drop the burner would turn off. We went back to a regular hot water tank and are happy.
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Old July 26th, 2007, 08:04 PM   #19
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Quote:
Originally Posted by TJ SKWIGhoo.com View Post
i am a hvac installer by trade and i have installed these before, i believe the brand we installed is RINNAI... and you would definately need someone qualified to install one.... but they are sweet! but the guy above me may be correct in saying that it may not solve your problem... there is an alternative though... its kind of like a recirculation pump.... you should probably talk to a plumber about it though... basically it recirculates the hot water throught the pipes when your not using it to keep it hot in the line at all times...
x2 on the rinnai.. ive been in quite a few homes with these and they kick ass.. lots of new homes are being built with these..
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Old July 26th, 2007, 08:28 PM   #20
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One solution is to install one of these under your sink:

http://www.amazon.com/exec/obidos/tg...?v=glance&s=hi

Plumb it into your hot water line. That way you will have 4 gallons of hot water right there when you need it (4 gallons is usually alot more than you will use at one time in a kitchen). If you need more just let the water run a bit longer until the hot water comes from the water heater across the house.

If all of the fixtures are far away from the water heater then install a wall mounted unit, that heats the water as it passes through, alot closer to the fixtures. An electric one will not need a vent...just a 220 line.
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