Demand heater for SHW backup [RE-wrenches]

[Tom Lane]

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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
>
>
>
> Ian Woofenden, Home Power wrote:
>
>>
>>
>> Hi Wrenches,
>>
>> What do you recommend in on-demand water heaters for solar domestic hot 
>> water systems? I'm looking for specific brands and models that you have 
>> used and are happy with.
>>
>> Propane and electricity are both available. Which is better/more 
>> economical? I'm partial to the idea of electric because it could at least 
>> potentially be powered renewably, either on-site or via "green power".
>>
>> A modest or non-existent idle draw would be nice, since there will be a 
>> PV system, and it would be preferable not to use a significant amount of 
>> its production maintaining the heater's electronics.
>>
>> Thanks,
>>
>> Ian
>>
>
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