Demand heater for SHW backup [RE-wrenches]

[Sky Sims]

I use a small on demand electric unit in my office. 4 to 6 people in the
office. I wouldn't want to take a shower with it but for giving warm
water at the sink for hand washing its perfect, puts out a steady warm
flow of water with in a few seconds. With the one or 2 gallons of hot
water consumption a day, I'd be hard pressed to believe there is a more
efficient, convenient and reliable method for getting hot water in this
scenario.

Sky Sims
Ecological Systems
www.ecologicalsystems.biz
ph)732-462-3858  fax)732-462-3962
 

-----Original Message-----
From: Wilco Vercoelen [mailto:w.vercoelen at dommelvalley.ca] 
Sent: Wednesday, August 22, 2007 11:00 AM
To: RE-wrenches at topica.com
Subject: RE: Demand heater for SHW backup [RE-wrenches]


Hi guys,

I can tell you from my experience that on demand water heaters are
preferable to tanks, because the do not have the standby losses. This
makes
them more efficient in usage, but not as a unit itself which is about
90%-95%, which is still pretty good. There is a difference between the
two.
If you combine solar hot water with an on demand modulating boiler the
volume of water is greater than without, because the unit does not have
to
work that intensively, temperature rise.
We prefer Gas over Electric because of efficiency and the possibility of
going off the grid in the future.
It takes a little longer to get hot water when you open the tap, but
also
depends how long the lines are. Conventional systems can also take up to
30
seconds to get hot water, so you decide. We tested this at different
houses.
With demand systems, the unit requires a minimum water demand to start
up or
kick in.
The lifespan of a demand boiler is 20 years compared to 13 years for a
conventional tank. Keep in mind the quality of water when you are on a
well.
Preferable is the Rinnai 2532. With everything, there is good quality
and
bad quality.
Some of the systems installed where poorly installed with all the
problems
associated with it. If you want to combine radiant heat with on demand
check
the Viessmann Combi unit 6-24C.
It also depends on how flexible you are as a human being when it comes
down
to change. People are generally sticky.

Good luck!
----


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