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re: tankless water heaters
17 dec 2005
logan shaw wrote:
>david fraleigh wrote:
>> make your own.... i posted early on in this thread
>> about my experiences with my tankless heater and want to elaborate a
>> little on them... especially as it might address some of the hesitancy
>> that others might feel about trying them... specifically the high cost
>> and the hard to get parts... make your own tankless heater... i did
>> and it cost me less than $50 and it has been going strong now for 10
>> years... what you need is two 16" lengths of 1" galvanized pipe a
>> couple of 1" "tees" , 2 screw-in hotwater heating elements, a
>> contactor and a flow switch... you assemble the pipes so that they
>> look like a u with a tee in between them which allows you to screw in
>> the heating elements from both directions... (i understand how a
>> picture is worth a thousand words now)... put the flow switch in the
>> line,...
why 2 elements? with 12k btu/h (3500 watts), we can heat 12k/480(110-60)=0.5
gpm from 60 to 110 f. h&r (800) 848-8001 http://www.herbach.com sells new
tm93hvc2527 3500w 240 vac chromalox immersion heaters for $6.95. how can we
combine this with a greywater heat exchanger?
>you mean like this?
>
>
> ###*-------------*------------------------------
> ###=============================
> ###*----\ /----*------------------------------
> | |
> | |
> * *
> | |
> | |
> ###*----/ \----*------------------------------
> ###=============================
> ###*-------------*------------------------------
>
>
>the "###" and "======" are the screw-in heating elements, the "---"
>(and "|") is the walls of a pipe, and the "*" is where two pieces
>of pipe are joined together.
nice. how can we control it? grainger's $215 4rc68 flow switch might work,
but it's expensive and only handles 3.7 amps with no temp control. can we
turn it on with an occupancy sensor? would we get steam whenever a standard
$10 water heater thermostat cycles, if it's screwed to a railroad tie plate
welded to the pipes? or if we suddenly stop the water flow? that might be ok.
nick
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