Demand heater for SHW backup [RE-wrenches]

Matt Tritt solarone at charter.net
Wed Aug 22 11:22:49 PDT 2007


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Todd,

If you take into account the rapid buildup of calcium carbonate on 
electrical water heater anodes, and the resulting loss of efficiency, 
how do you figure that electric is the way to go? In my experience, 
people rarely (if ever) service their water heaters, and that especially 
includes the heater elements. Also, the huge hit from electric on an 
off-grid system seems counter intuitive for folks with smaller battery 
banks, no?

Todd Cory, Mt. Shasta Energy Services wrote:

>
> Gas over electricity due to efficiency? That makes no sense as the 
> efficiency is so much lower in the gas unit.
>
> A super insulated tank heater has next to no standby losses and will 
> last indefinitely if the anode is changed every few years. Plus no 
> calling or freezing potential.
>
> Todd
>
>
> Wilco Vercoelen wrote:
>
>> Hi guys,
>>
>> We prefer Gas over Electric because of efficiency and the possibility of
>> going off the grid in the future.
>>  
>>
>> The lifespan of a demand boiler is 20 years compared to 13 years for a
>> conventional tank.
>>
>
>
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