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Re: [Shop-talk] was tankless/instant water heater now slow hot water to

To: shop-talk@autox.team.net
Subject: Re: [Shop-talk] was tankless/instant water heater now slow hot water to fixture
From: Bob Spidell <bspidell@comcast.net>
Date: Wed, 26 Jan 2022 08:24:37 -0800
Delivered-to: mharc@autox.team.net
Delivered-to: shop-talk@autox.team.net
References: <8de1034a-23fc-5158-ce77-d9e323a882f7@comcast.net> <B2CD7145-9663-4B7C-BFF7-A2853DE53E40@icloud.com>
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Thanks for the replies.


On 1/26/2022 8:10 AM, Tom Coradeschi wrote:
> The system pulls cold water from the hot supply where it is located and 
> pushes it into the cold supply line. Both hot and cold sit at the same 
> pressure, so a small differential is all that is required to create flow thru 
> that loop.
>
> Tom Coradeschi
> tjcora@icloud.com
>
>> On Jan 26, 2022, at 10:37 AM, Bob Spidell <bspidell@comcast.net> wrote:
>>
>> Got a question: Where does the (heating) water being shunted from the hot 
>> water line to the cold water line by a pump go? I'm on a well, with a 500g 
>> storage tank that sits at about 50psi, and I suspect municipal water is at a 
>> similar pressure. Mine would go back to the tank--if the pump can overcome 
>> the pressure--but where would municipal water go?
>>
>>
>>> On 1/25/2022 6:00 PM, Brian Kemp wrote:
>>> I've been looking at this.  We have a guest shower that takes about 3 
>>> minutes to get hot water.  Here is a sample product designed specifically 
>>> to be mounted at the far destination, like under a sink.  Push the button 
>>> and the pump runs, pushing hot water into the cold pipe until the pump 
>>> senses the water is hot.
>>>
>>> https://chilipeppersales.com/collections/frontpage/products/chilipepper-on-demand-hot-water-recirculating-pump-model-cp9000-b-version-wireless-wired
>>> https://www.homedepot.com/p/Rheem-1-25-HP-Hot-Water-Recirculating-Pump-with-Under-Sink-Kit-RH18537/301852244
>>>
>>> Here is a sample video:
>>> https://www.youtube.com/watch?v=AQC_shrv8KA
>>>
>>> I have not used any of these products.  I hear the Chilipepper one is loud.
>>>
>>> Brian
>>>
>>>> On 1/25/2022 8:45 AM, Pat Horne wrote:
>>>> This is off target from the OP.
>>>>
>>>> Iâ??ve seen homes/shops where it can take minutes for hot water to reach a 
>>>> fixture. One DIY fix for wasting water I ran across was to add a small 
>>>> pump, check valve & a bit of control circuitry at the fixture. Plumb the 
>>>> pump & check valve between the hot & cold lines so that when the pump runs 
>>>> it will transfer water from the hot line to the cold line with the check 
>>>> valve keeping the cold water from getting into the hot line.
>>>>
>>>> Add a push button near the fixture that turns the pump on for either a 
>>>> preset time or monitor the hot line & turn off the pump when hot water is 
>>>> present.
>>>>
>>>> It still takes the same amount of time but it doesnâ??t waste water.
>>>>
>>>> Peace,
>>>> Pat
>>>>
>>>> Pat Horne
>>>> We support Habitat for Humanity
>>>>
>>>>
>>>>> On Jan 25, 2022, at 9:38 AM, Jim Stone <1789alpine@gmail.com> wrote:
>>>> It is plumbed to the hot water line.  These heaters have two potential 
>>>> uses: as a sole source of hot water (e.g., for a sink where there isnâ??t 
>>>> another hot water source) or as supplemental heat for situations like 
>>>> mine.  For us, it is really just for hand washing and dish washing and not 
>>>> to have to waste so much water waiting for the main heater to kick in.  I 
>>>> donâ??t notice a drop off after extended use, so I assume 7 gallons is 
>>>> enough to allow the main hot water to come through.  The installation 
>>>> instructions cover both methods and do warn you not to set the heat on the 
>>>> main unit too high; as I recall, the max for incoming water was something 
>>>> like 140º.
>>>>
>>>> Jim
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