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

[Tom Coradeschi]

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 at icloud.com

> On Jan 26, 2022, at 10:37 AM, Bob Spidell <bspidell at 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.
>>> 
>>> I’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 doesn’t waste water.
>>> 
>>> Peace,
>>> Pat
>>> 
>>> Pat Horne
>>> We support Habitat for Humanity
>>> 
>>> 
>>>> On Jan 25, 2022, at 9:38 AM, Jim Stone <1789alpine at 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 isn’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 don’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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