[Cob] Re: pipes

[karl and tabitha o'melay]

the minimum gallons per minute is the critical information in your 
on-demand water heater if you have an extremely low-flow-shower-head and 
it's below the min gpm then that's probably where the problem exists 
plus mineralized low-flow-shower-heads are even lower flow. takagi is 
the worst at this problem and rinnai (in my humble opinion) is the best. 
paloma is great too.

karl

Barbara Roemer wrote:

>Check on your water pressure before embarking on a pex project or any
>plumbing with an on-demand water heater.  Our pressure is fairly low and we
>have conventionally sized pex runs (larger for washer, smaller for
>sink/toilet/tub) which do not work well with the combo of mixing valves and
>the instant-on heater.  It's gotten worse over three years as our water is
>heavily mineralized, as well, so now, to get hot water at any tap other than
>the washer, we have to turn another tap on to a trickle so there is plenty
>of volume running through the on-demand heater.  We understand we can
>correct the extremely wasteful problem either by replacing the on-demand
>heater with a conventional one; putting in a pre$$sure tank; or replacing
>the valves with non-mixing types (a line to a faucet for hot, and a line to
>faucet for cold).  Although it's the most costly option, we will probably
>opt for the pressure system so we'll have sufficient pressure to run a drip
>system for the orchard and gardens.  We worked with a plumber, but our pex
>installation was his first.  Also, the local plumbing store loaned us the
>pex tools since they're pretty pricey and Home Despot wants to sell you the
>materials and the tools.
>
>Barbara
>
>
>
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