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Posted by john on September 6, 2008, 2:27 pm
Please log in for more thread options Even though the plants would probably like the extra CO2, I want to keep
the combustion out of the greenhouse and in a more controlled area. I
am not comfortable with any surfaces or heat source in the greenhouse
hot enough to start combustion; that's part of the appeal of the
hydronic system.
Valid concern with the demand water heater now that you mentioned it. I
have seen commercial boilers that require a minimum return temp, but you
say that these have a max allowable entering temperature. Considering
what they are designed for that makes sense. I will investigate the
boiler idea further.
Thank you for your input, that may have $aved me a co$tly mi$take.
John
Neon John wrote:
> On Fri, 05 Sep 2008 20:45:33 -0500, john
>
>> Has anyone attempted to use a domestic tankless water heater as a source
>> for radiant heating? I'm searching for ideas to back up my solar for
>> days of limited or no sun shine....
>
> My Paloma's manual warns in very strong language not to attempt that. Knowing
> how it works, I fairly sure the concern is with hot return water overheating
> the gas regulator that varies the flame according to water flow.
>
> Other brands that use electronic controls may be more suitable but then you
> have the electronics to power and hope not to fail.
>
> Why not just use a small hydronic boiler? The cost shouldn't be that much
> different. You'd have a product designed for the application. My Paloma, the
> largest one they make, cost around $1200. It's been a long time since I
> bought one but I don't recall a hydronic boiler of similar capacity costing
> much more.
>
> You might also take a look at the current crop of wall-hanging
> ceramic-surface-burner-equipped ventless propane heaters. Most of the heat
> output is in the form of infrared radiation which means that a fairly small
> heater can keep you warm even in a fairly large room.
>
> My primary heat source is wood but I have one of those heaters as backup. I'm
> having a senior moment, but I believe that it's rated at 18kBTU. I can't get
> far enough away from it to be comfortable when it's operating on high so it
> usually operates on the middle setting. It'll run for a couple of weeks on a
> 100 lb tank of propane. This type of heater is cheap enough that you could
> buy one for each room in a big house for the cost of a tankless heater or a
> boiler.
>
> John
>
> --
> John De Armond
> See my website for my current email address
> http://www.neon-john.com
> http://www.johndearmond.com <-- best little blog on the net!
> Tellico Plains, Occupied TN
> In theory, there is no difference between theory and practice. In practice,
there is.
>
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