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Choosing an Indirect Hot Water Heater
Hi, I'm new to this board and have previously posted this to an earlier thread. I thought it would be better to start a new thread.
I am a general contractor and am doing research for my customer. The
plumber I use and my customer's plumber have given us a few options. We
are all set on sizing. My customer is wary because he had a glass lined
storage tank in the past, it failed and flooded his finished basement
and he's been living with a poor quantity of hot water from the existing
(probably scaled fouled) tankless coil in his oil burner. I explained
that it probably failed because he never maintained the anode. He wants
my opinion, on ss versus lined, because I have more knowledge about
water treatment in general and his water quality specifically. I
recently had his well water tested before and after his water
conditioner (softener). I wanted to find out if the system was doing its
job and if it was properly sized for his home and his water quality,
before I considered what type of hot water storage I would advise he
choose. Both plumbers gave us similar options of going with a storage
tank or an indirect and options for stainless or lined with anode(s).
The water tests showed 7 gpg hardness a pH of 6.7 and 16.5 mg/L of
chloride before and after the .75 cubic foot (24,000 grain) conditioner.
This proved my theory that the 16 year old conditioner was not doing
its job. After analyzing their water consumption and usage patterns,
checking the performance of the well and pressure tank, measuring the
static pressure and gpm flow at the tank and various fixtures throughout
the home we concluded that a new water softening system would be the
first priority. We will be upgrading to a 1.0 cubic foot system which I
will purchase, install and program. I will have to retest for chloride
once the system is online.
Since the water will still contain chlorides ( I don't know how much
yet), both plumbers agreed with my opinion that stainless may not be the
I researched different manufacturers warranties on their stainless
versions and as I recall chlorides were acceptable up to a certain
limit, but just because they would replace the unit doesn't mean I would
jeopardize my customer having to experience another flooded basement.
Does anyone know if a stainless tank can be protected by adding an
anode? This is the only link I could find when doing a search for
"stainless steel hot water tank with anode" I will be speaking with one
of their reps today. <a href="http://alliedboilers.com/indirect_fired_water_heater.php">http://alliedboilers.com/indirect_fired_water_heater.php</a>
We will probably be choosing a lined steel tank with one (and I'll add
another, if possible, prior to install) or 2 anode(s). We have decided
to go with an indirect instead of just a storage tank because we will be
bypassing and/or removing (any suggestions?) the boiler's tankless
coil. Then we still have to decide on a tank in tank design or one with a
coil. Would a stainless steel circulator be ok or is bronze preferred?
Any suggestions or opinions will be greatly appreciated. Thank you!