the Takagi Jr apparently has an electric heater in it that will turn on
when the outside temp drops below 5 F out. this could add up to real
kwh depending on it's final location.
Karl
Ian Woofenden wrote:
Hi Conrad,
At 12:35 PM -0500 11/14/08, Conrad Geyser wrote:
Hey Ian,
The key is that you want "temperature modulated", not "flow modulated".
As a terminology guy, I really appreciate you bringing up this
distinction.
There are a number of temperature modulated units out there, the
Rinnai and
Takagi probably being the most popular. We have had one problem with a
solar preheat through one of these and that is if the solar water is
pretty
close (around 115 or so) the unit doesn't come on.
I have not experienced this with the Bosch 1600PS.
In normal use in our system, it comes on for maybe 60 seconds and the
flame gradually diminishes until it goes out as the solar- or
wood-heated water hits it.
The factory settings
don't let you take the temperature higher than 125 to try to overcome
this.
Both the Rinnai and Takagi have electric ignition, no pilot!
Yes, but both use AC, and as I recall from a neighbor who has two, the
Rinnai uses a significant number of kWh. I would like to see numbers
on this for other units.
Thanks,
Ian
Cheers,
Conrad
Cotuit Solar
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ian
Woofenden
Sent: Friday, November 14, 2008 12:05 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] tankless hot water and pumping question
Hi Todd and all,
Since this is a renewable energy list, I think it's worth mentioning
that installing a modulating demand heater will make the installation
"solar ready".
I'm only aware of one tankless heater that accepts pre-heated water
and has no electrical usage, and that's the Bosch 1600PS (which I
live with). I'd love to know if there are others, since this is a
common need in off-grid systems. Some of the other modulating heaters
on the market have significant electrical demand, which is a deal
breaker for us poor off-gridders.
Ideally, we'd have such a unit that doesn't have a standing pilot,
but I've never heard of such a product, though there are
non-modulating heaters that run on piezo igniton and a couple of
D-cells. Bosch's hydro unit is a neat concept, but it's not
modulating.
I hope others will share their knowledge and experience.
Ian
--
Ian Woofenden <[EMAIL PROTECTED]>, Senior Editor, Home Power
magazine
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