The latest episode of "Ask This Old House" showed Rich Trethewey
installing a Taco D'Mand hot water recirculating pump.
As usual, the show doesn't give enough information, so it's hard to say
whether they used the 006 or the 008. In any case, the pumps are about $400.
What do you think about these units? Are there cheaper ones? I was never
in favor of them until I saw that you press a button when you're ready
to use hot water.
My kitchen is a long way from my hot water heater. This device would be
very handy unless it causes diseases or something.
Could be. I don't see how pushing a button when you enter a bathroom is
much different than turning on the hot water tap. Factor in the cost of the
pump, the cost of installation, the cost of operation (electricity) and the
cost of maintenance and it doesn't seem terribly efficient to me, at least
at the rate I pay for water v. electricity.
Actually, now that I think about it, having to push a button to call for hot
water is an extra step. If you just turn on the tap when you enter the
room, you're done. No button pushing, no mechanical pump to wear out or
consume electricity. The tap's turned on already. As someone else noted,
the "idling" heat of a pump loop helps heat the house in winter, and that
make it harder to calculate its true benefit. I still don't know what the
real numbers are concerning lifetime operating costs. I suppose it comes
down to how many seconds you're willing to wait to have hot water, how long
the run is to the water heater, how much clanging the pipe make at 3AM when
you're washing your hands, etc. I can't really see it saving any money.
They must do something because so many people install them. But then again
people buy billions of dollars of worthless diet supplements . . .
I'm seeing more and more preposterous claims on ads lately, as in the Honda
MPG ratings that they've been sued for inflating. It's always a good idea
to examine them fully and try to confirm where the real numbers are.
Wireless doorbells, for instance, seem to have a multiplier of at least 2X
when it comes to stating their range. (-: Battery life is another
statistic inflated to almost meaninglessness.
What they do and why people install them is they
can eliminate waiting for hot water to arrive at
a point-of-use that's a long distance from a water
heater. It's a solution to a large house where the
water heater is in the basement at one end and
you have a bathroom on the second floor at the
I agree that any cost savings in energy and water
are likely to be small and could easily be exceeded
by the cost of the pump, installation, etc.
On 2/16/2012 8:30 AM, email@example.com wrote:
a passive gravity system will do the same silently and transparently.
And the only cost is the extra tubing from that point back to the
heater. It's such a duh solution, I can't believe EVERY house doesn't
remove the "not" from my address to email
The difference though is that a passive system is
losing heat through those pipes 24/7 whether water
is being used or not. How much that amounts to
I don't know. If they were well insulated it might
not amount to much and could be a good system.
In *most* areas of Florida, only a fool would attempt to dig a basement.
You might start out digging a basement but by noon you'll soon have a
swimming pool. And the following morning you'll have gators in it.
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