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Installed a tankless HW over the weekend

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Installed a tankless HW over the weekend

Old 08-16-2010, 08:42 AM
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Default Installed a tankless HW over the weekend

Friday night about 8:30 I am sitting on the back porch drinking beer and watching it rain. I go to the garage to get another beer and I hear water running in below the hot water heater, sits right next to the fridge.

Look below the hot water heater and water going everywhere, hot water heater had stb.

It was a direct vent, and I like that fact that the exhaust on the direct vents are very low profile. I can't stand the tower vents that look like a cell phone tower mounted to the side of your house.

So I search all around town(on saturday) and can not find a direct vent hot water heater. Could get one ordered but wouldn't get it until wed. Can't go that long with out hot water.

So a call to my neighbor that owns a heating and air company, and he tells me he can get a Rinnai tankless, and would go get it for me. This is 2:00 saturday afternoon. So I say bring it on.

It is a 9.4 Rinnai LS

Only took a couple of hours to install and I re-did the water lines and such to make it look a lot better in there.

I really like the small foot print, I mounted it up high to take advantage of the vent hole from the previous WH. Took a shower last night and this morning and it worked great. One thing I have noticed is there you have to wait about 5 sec before hot water comes through. Not sure if there is a way to program it for quicker.

After a while I will post how it goes. If you are thinking about getting one, I recommend installing yourself, if you are handy it is very straight forward.

So
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Old 08-16-2010, 09:03 AM
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I just had a Rinnai system installed to replace the gas H/W tank and
the oil fired boiler for the forced hot water heating. One system to
handle both jobs. I noticed as well that it takes a bit longer for the
hot water to hit the tap then with the old system, but I figure that's
a small price to pay for not having to keep 50 gallons of water hot 24/7.
When they first fired up the heating portion, they (plumbers) didn't think
it was working. Turns out the thing is so quiet, you have to almost put
your ear up against it to hear it. And it just looks so cool hanging on the
panel they made for it.

Last edited by CJS; 08-16-2010 at 06:43 PM.
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Old 08-16-2010, 09:17 AM
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How many showers will this thing run at once?

5 in our house and at times there will be 3 in separate showers somewhere (e.g. Sunday morning getting ready for church, or before going out to dinner).
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Old 08-16-2010, 09:35 AM
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I've had a Rinnai LS (not sure of the model, but it's one of the largest ones) for about a year now. Yea, it takes a little longer to get HW at the taps, but it works great. I've taken a shower with both the cloths and dishwashers running and had HW. I'm an a well, the only time it got cold was right before the pump recharged and the washing machine started to fill. The washer is right next to the HHW and when it kicked on I think the pressure drop temporarily throttled the heater back until the pressure built back up. It only took a few seconds.
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Old 08-16-2010, 09:41 AM
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I am told the 9.4 will service 5 outlets, also says this in their brochure - Shower, dishwasher, clothes washer, etc. All together.

But even if it is 3 it works for me.

Originally Posted by Menzies View Post
How many showers will this thing run at once?

5 in our house and at times there will be 3 in separate showers somewhere (e.g. Sunday morning getting ready for church, or before going out to dinner).
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Old 08-16-2010, 09:43 AM
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Here is the one I installed. http://www.rinnai.us/tankless-water-...vb2735ffud-us/
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Old 08-16-2010, 12:55 PM
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I installed one during the winter and set the temp so that i could shower with just the hot faucet open with no cold water mix. That was perfect till summer came along. It is too hot now that it is not heating cold water. Adjusting it was a bit touchy. If I used too much cold mix the flow of hot water wasn't enough to keep the burner lit. I had to adjust the heat and flow controls to get it right. I love the way it works.
Mike
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Old 08-16-2010, 01:24 PM
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Thinking about doing the same - and repiping my main wall (laundry, kitchen, and master bath) along the outside of the house while I'm at it. Interested in hearing more feedback.
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Old 08-16-2010, 02:11 PM
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Get one. They're big in Europe since they don't have a lot of space, so it's not new tech by any stretch.

I got a Bosch and installed myself. If you have 3 bathrooms, get on that is supposed to service 5, etc. Always upsize so you wont have any issues. We love ours and haven't had a problem since. Also, I put a refrigerator where the old hot water heater was and have the instant hanging on the wall where there wasn't anything before.

Such a space saver and it's nice to know nothing is running when it's not being used or I am away and it won't crap out and start leaking everywhere.

Don't buy it to save money since they aren't cheap but they look great, work well and don't take up any room.......and that's what you are paying for.

Good luck,
J
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Old 08-16-2010, 05:58 PM
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Originally Posted by bellsisland View Post
Friday night about 8:30 I am sitting on the back porch drinking beer and watching it rain. I go to the garage to get another beer and I hear water running in below the hot water heater, sits right next to the fridge.

Look below the hot water heater and water going everywhere, hot water heater had stb.

It was a direct vent, and I like that fact that the exhaust on the direct vents are very low profile. I can't stand the tower vents that look like a cell phone tower mounted to the side of your house.

So I search all around town(on saturday) and can not find a direct vent hot water heater. Could get one ordered but wouldn't get it until wed. Can't go that long with out hot water.

So a call to my neighbor that owns a heating and air company, and he tells me he can get a Rinnai tankless, and would go get it for me. This is 2:00 saturday afternoon. So I say bring it on.

It is a 9.4 Rinnai LS

Only took a couple of hours to install and I re-did the water lines and such to make it look a lot better in there.

I really like the small foot print, I mounted it up high to take advantage of the vent hole from the previous WH. Took a shower last night and this morning and it worked great. One thing I have noticed is there you have to wait about 5 sec before hot water comes through. Not sure if there is a way to program it for quicker.

After a while I will post how it goes. If you are thinking about getting one, I recommend installing yourself, if you are handy it is very straight forward.

So
Is yours gas? here the code does not let homeowners install gas
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Old 08-16-2010, 06:08 PM
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Yeah it was gas, my neighbor who owns hvac company, and is licensed hooked the gas up. I did everything else.
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Old 08-16-2010, 06:18 PM
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Originally Posted by bellsisland View Post
Yeah it was gas, my neighbor who owns hvac company, and is licensed hooked the gas up. I did everything else.
thats what I did and I love the heater sometimes it gets clogged but the in line filter is easy to clean and once a year I run vingar thru it due to lime in northeast water. I fugure it will pay for it self in three to four years in gas savings here.
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Old 08-17-2010, 07:47 AM
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You got a great unit, and have a great neighbor to get it for you! Kudos on doing it yourself and not hiring some lacky-"pro" to do it. You likely did the job much better (and from the way you cleaned up the plumbing, it sounds like you did)!

The delay is normal, the only way to correct it is to put a "point of use" heater -- IMHO a total waste of money -- you'll get use to the delay, and it far outweighs NOT having to heat water when you're not using it AND having all the hot water you can use!

I have had a Baxi Luna unit (both dom. hw and heat) for about 5 or 6 years now and it has been terrific. I'll NEVER install or use another tank heater again!

Enjoy,
Pete
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Old 08-17-2010, 08:20 AM
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They are only more efficient because there is no heat loss from storage. Properly insulated, a regular heater will rival the tankless units for cost of operation. Factor in the initial cost, and the value of a tankless unit pales.
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Old 08-17-2010, 08:38 AM
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I have a tank HW heater that's probably going to need replacing soon. I was thinking tankless, and I hear they're great for applications like filling a big tub where flow-rate isn't critical (I have a 60gal whirlpool bath w/ a 40gal tanked heater that doesn't quite cut it). But, I also have some fancy showers w/ multiple heads in each (figure 4 going at once max). How would these work for my application in Northern climates where the groundwater in the winter may be 40 degrees?

The Rinnai above claims a 30-degree rise. Does that mean I'll only get 70-degree water in the winter, or will I still be able to flow 120-degree water to 3-4 outputs (~7.5-10 gpm) simultaneously? Or would I need to maybe install 2 in series (one to bring the water up to 'room temp', then the second to heat to desired temp)?

BTW - When showering with my current tanked HW heater, I still have to wait 5-10 seconds for the hot water. I think it has more to do with the length of pipe from the heater to the shower than the type of heater. The sitting water in the pipe that's cooled just has to be pushed out.
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Old 08-17-2010, 08:47 AM
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The one thing about tankless ( I have 2 installed at my house) if your water is hard, plan on cleaning out and lubing the control valve per the manual. I think the manual says every 3 years, and replace every 5 years. Kind of a hassle and a new control valve is not that cheap. I went 7 years without doing anything on my Bosch before it crapped out. Had to buy a new one.
Having plans drawn to build a new house and don't think I'll be utilizing the tankless heaters.
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Old 08-17-2010, 09:48 AM
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Originally Posted by billinstuart View Post
They are only more efficient because there is no heat loss from storage. Properly insulated, a regular heater will rival the tankless units for cost of operation. Factor in the initial cost, and the value of a tankless unit pales.
No.
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Old 08-17-2010, 10:03 AM
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yes
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Old 08-17-2010, 10:21 AM
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Originally Posted by westbootie View Post
The one thing about tankless ( I have 2 installed at my house) if your water is hard, plan on cleaning out and lubing the control valve per the manual. I think the manual says every 3 years, and replace every 5 years. Kind of a hassle and a new control valve is not that cheap. I went 7 years without doing anything on my Bosch before it crapped out. Had to buy a new one.
Having plans drawn to build a new house and don't think I'll be utilizing the tankless heaters.
If I had water that was hard to that point, I think I would have a water softener. If I was building a brand new house, I know I would.
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Old 08-17-2010, 10:28 AM
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Electric heaters are 100% efficient, in terms of energy in vs. heat out. The ONLY inefficient aspect is the storage of the heated water, and its loss of energy to the environment. however, the cost of a new, high current circuit to the point of use device, the plumbing required, and its initial cost, makes the payback less attractive.
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