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  • Reducing 3/4 connection to 1/2 results

    I am installing a point of service (tankless) water heater in my outdoor kitchen. I want to use the Bosh GL-6+ model which will supply approx 7 gallons of hot water.

    I also T'd off to outdoor shower that will be used just to rinse off.

    I have run a 1/2 PVC water line BUT the GL-6+ model has a 3/4 inch in and out connection. I know I can reduce this to 1/2 to connect to the piping.
    How will reducing this effect the supply of water to the heater?

    Will there be enough water supply?

    They have a 4.0 Gallon GL-04 model that does have 1/2 inch in and out connections but it will prouduct about 2 gallons of less water and I would rather use the 6+ gallon model because I will have more hot water and it is only $40.00 more in cost.

    Please advise me if you think reducing the connection from 3/4 to 1/2 will create a problem?

    i just found this forum and this is my first post of what I am sure will be more later on.l

    Thanks

    Tom
    Last edited by TGMcCallie; 09-08-2010, 05:25 PM. Reason: Did not edit after all. I did not know if I checked to get e-mail replies.

  • #2
    Re: Reducing 3/4 connection to 1/2 results

    Why reduce at the heater.Personally I would keep 3/4" atleast till I got to the first fixture and then go 3/4" x 1/2" X 1/2 " to the shower but thats just me ..
    ''Beer is proof that God loves us and wants us to be happy" Benjamin Franklin

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    • #3
      Re: Reducing 3/4 connection to 1/2 results

      Its not how i would have done it ...
      With that said with just a sink and one shower head you wont see much difference in the flow

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      • #4
        Re: Reducing 3/4 connection to 1/2 results

        How long is the 1/2" supply run and what is the pressure

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        • #5
          Re: Reducing 3/4 connection to 1/2 results

          1/2 line is connected at the 1/2 inch line that comes from the sprinkler meter. Altogether, I guess it is bout 100 feet.

          We have tremendous water pressure especially at night but I have it reduced on my regular meter line and also on the irrigation meter line but don't know how much the pressure is reduced to.

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          • #6
            Re: Reducing 3/4 connection to 1/2 results

            Originally posted by OLD1 View Post
            Why reduce at the heater.Personally I would keep 3/4" atleast till I got to the first fixture and then go 3/4" x 1/2" X 1/2 " to the shower but thats just me ..
            ************************************************** *******

            The line going to the heater is the 1/2 inch line. I installed it prior to deciding to put in the hot water tankless heater so now it is under the new concrete and I can not change the supply line.

            I wanted to know if it would cut down the pressure much if I use a reducer at the heater becuse the heater has 3/4 connections in and out. I would have to use a 3/4 to 1/2 reducer coming out of and going into the heater due to the fract that i have the 1/2 inch line burried under concrete.

            Tom

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            • #7
              Re: Reducing 3/4 connection to 1/2 results

              Tom,

              First of all, the water heater you're looking at, the Bosch GL-6+, is not a tankless unit. It's a tank type heater with a small tank.

              Assuming you have a regular shower head and not some super high-flow rain head, you should be fine. Your run of 100' of 1/2 pvc is long, but the easiest thing to do is simply try it. Connecting the heater up is a five-minute proposition.

              The 1/2 inch pipe connections really are not your problem... going to the 4 gallon model with 1/2 pipe inlet & outlet will not help. The issue is not the connections on the water heater or the adapter you would need to install it, it's the 100 feet of 1/2" you have as a supply line. But I would bet it will be ok.

              The problem you ARE going to have is that the mini tank heater is going to run out of hot water after about a five or six minutes of showering. Not so good if you have a load of people getting into or out of the pool or spa....

              I use one of those mini-tanks for instant hot water inside the house (not a fan of the recirculating systems) and it has been great.

              Outside, I have a Titan tankless electric dedicated to the outdoor shower. It was an inexpensive unit ($200), required electrical wiring, GFI etc., mounting in a protected dry location - all of which added to the cost. BUT... it never runs out of hot water no matter how many folks need to use it.

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