Demand heater for SHW backup [RE-wrenches]

[Todd Cory, Mt. Shasta Energy Services]

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This is true, the standby losses (up to 40%) on a tank style gas water 
heater are horrible. The whole time the unit is not heating, the 
convection up the center flue is cooling the tank. I am surprised no one 
ever came up with an automated draft blocker on these units.

Todd



Tom Lane wrote:

>
> Only on demand gas water heaters save money about 20% versus low end 
> gas water. heaters   gator tom
> ----- Original Message ----- From: "Todd Cory, Mt. Shasta Energy 
> Services" <toddcory at finestplanet.com>
> To: <RE-wrenches at topica.com>
> Sent: Tuesday, August 21, 2007 8:10 AM
> Subject: Re: Demand heater for SHW backup [RE-wrenches]
>
>
>>
>> While everyone thinks demand heaters are oh-so-efficient, in all 
>> honesty they really do not save much energy. If you have a SDHW 
>> system, you already have a tank... so super insulate that and use the 
>> top element as your (electric) back up. Propane demand units for 
>> backup are prone to freezing, scaling and not 100% efficient like an 
>> electric unit is. If you must use one of these things, electric is 
>> the way to go but be warned the current draw is huge.
>>
>> Todd
>


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