I'm looking at replacing my 17-year-old 75-gal Hot Water Heater with
two 50 gallon units.
The current one vents into the chimney by way of galvanized ductwork.
What is the recommended way to vent the dual heater setup?
I am concerned that if one heater goes off, exhaust gas from the other
one might find its way back into the house by traveling backwards thru
the ductwork of the heater that is off.
That's a thought.
Actually, the 75 has been more than adequate for my needs, so another
75 would do me just fine
The reason I was looking at two 50s was mainly because they would be
easier for me to get down the steps into the basement. The existing
one was put in by professionals, so they had ample manpower to
manhandle it down the steps. I have learned to plumb in the time
since that installation.
I asked a plumber once about using two 40s, but he suggested that if
two 50s fit, then I should go for 2 50s.
Also, on a scouting trip to Home Depot, I did not see any 75s.
Can these be had other than by going through a plumber?
I'm not sure if the local plumbing supply place sells HWHs to DIYers.
It's pretty much a wholesale place.
Finally (and least important) I was thinking that with two heaters,
aprropriately plumbed, if one failed, I could bypass it, thus taking
the "emergency" out of any failure scenario.
Do you mean a furnace-boiler and water heater cannot share a chimney,
Its code here.
My old house had both too, very common. I recall recently that it is no
longer allowed, but I don't have any firm information. It may have been a
local code. I know that woodstoves and oil/gas burners are not allowed.
I've not had any reason to check so I'm not up to date on that.
Get a high output single tank. When you shop buy with comparing by EF
Energy Factor rating, most of what you get is 55-65 EF on standard
tanks so at best 35 cents of ever dollar is wasted, 2 tanks is not
smart. Your old tank may never of had the btu to keep up. You would
want a faster recovery. www.energystar.gov has ratings on all tanks,
there are higher efficency tanks to also consider. AO Smith has a
good commercial line.
nope there are good reasons to avoid tankless, no hot water at all
during power failures, excess up front cost, new gas lines and
possibly new meter because a large tankless has such high BTU, no hot
water at all with low flow like valve just opened a little, delay from
water on till hot water is available, tankless must detect water use
then yurn on burner. tankless payback period will likely exceed life
of unit, plus unit needs regular service from trained technician.
regular tanks tend to be install and forget till they leak
Your really minimizing the number of availble models by saying no
many larger BTU units are direct power vent. normal chimneys may be
too small for a high BTU tankless
The number of overall constraints make the tankless a real adjustment
and hard to live with.
Like buying a tiny car to save gasoline when your 6 foot 4 and 250
Sure you can buy it, but will you be happy with your purchase?
Your biased and full of crap again. I have HW with no power on a
Bosch 117000 btu, I have battery ignition.
600$, well I got a 4.5 year 100% return, show me any investment as
My new gas line was about 8 ft or so, big fkn deal.
So dont open it a little, get used to it. A V8 doesnt accelerate
like a 4, do you still buy V8 cars.
Delay is maybe 30 seconds more but the burner lights in 3-5, I have
like most all a delay any way. Is your life that rushed 30 seconds is
such a big deal to save alot of money on utilities, CFLs have a delay
till they are bright.
What regular service you cant do your self, that is total crap what
A new meter. doughtfull, meters have excess capacity
Tankless, dont loose efficency from bottom scale every year as tanks
do,Tankless are the highest effecency waters heaters made with only a
few condesing tanks that can even come close to 82 EF, Tankless Takagi
is 94EF. Tankless coils last by design 30 years. For a few
inconviences you get a produst that can save you alot and last longer.
The lowest efficency tankless Ng is 82, avg tank is 55-65 EF, Tankless
go from 82-94EF Tanks go from 55-82 EF. EF is the only true rating
that is to be used comparing water heaters.
Lets not forget you never had one. I have one and I have tanks
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