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PV vs CV water heaters? danger@heat.com 12-21-2006
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Posted by danger@heat.com on December 21, 2006, 11:28 pm
So what do you guys think about the water heater debate? I
constantly get customers who have paid big bucks to have their home
audited and tested for efficiency ect...They tell the customer to
replace their conventional vented water heater with a power vented
one. I think a lot of people assume the power vent is high
efficiency because of the plastic vent. It doesn't condense so
obviously it's not. I have tested both using flue gas analyss,
found they run 75-80%. The power vent needs 120v though, so I lean
towards the PV actually being less efficient. Faster recovery time
though, lower input...so I dunno , confused...

What do you guys think?

-CanadianHeat


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Posted by Steve Scott on December 22, 2006, 7:43 am
The worst thing about a atmospheric vented water heater is the HUGE
standby loss. I imagine a PV WH is better in that regard. The
"problem" with a PV WH is they've got to be using fairly large amount
of possibly conditioned air to reduce the flue gas temp to the point
to where it's not excessive for the PVC.

We see lots of boilers and use an indirect fired WH in almost every
instance. Standby loss down to 1/4ºF per hour depending on the WH.

On 22 Dec 2006 04:28:53 GMT, DANgER (danger@heat.com) wrote:

>So what do you guys think about the water heater debate? I
>constantly get customers who have paid big bucks to have their home
>audited and tested for efficiency ect...They tell the customer to
>replace their conventional vented water heater with a power vented
>one. I think a lot of people assume the power vent is high
>efficiency because of the plastic vent. It doesn't condense so
>obviously it's not. I have tested both using flue gas analyss,
>found they run 75-80%. The power vent needs 120v though, so I lean
>towards the PV actually being less efficient. Faster recovery time
>though, lower input...so I dunno , confused...
>
>What do you guys think?
>
>-CanadianHeat


--
Keep your feet close to the ground.





Posted by Bubba on December 22, 2006, 8:23 am
On 22 Dec 2006 04:28:53 GMT, DANgER (danger@heat.com) wrote:

>So what do you guys think about the water heater debate? I
>constantly get customers who have paid big bucks to have their home
>audited and tested for efficiency ect...They tell the customer to
>replace their conventional vented water heater with a power vented
>one. I think a lot of people assume the power vent is high
>efficiency because of the plastic vent. It doesn't condense so
>obviously it's not. I have tested both using flue gas analyss,
>found they run 75-80%. The power vent needs 120v though, so I lean
>towards the PV actually being less efficient. Faster recovery time
>though, lower input...so I dunno , confused...
>
>What do you guys think?
>
>-CanadianHeat

I didnt know there was a debate.
Power-vented doesnt save money over atmospheric.
The power-vented is usually twice as expensive as the atmospheric.
Go with a tankless.
.............and No, I dont have one........yet.
Bubba

Posted by jamesgangnc on December 22, 2006, 8:42 am
Tankless gas is less efficient at heating the water. If the usage is
infrequent then the savings from not having to keep the water hot
outweighs that. In a normal household that is not usually the case.
There is the added advantage of never running out of hot water though.

Bubba wrote:
> On 22 Dec 2006 04:28:53 GMT, DANgER (danger@heat.com) wrote:
>
> >So what do you guys think about the water heater debate? I
> >constantly get customers who have paid big bucks to have their home
> >audited and tested for efficiency ect...They tell the customer to
> >replace their conventional vented water heater with a power vented
> >one. I think a lot of people assume the power vent is high
> >efficiency because of the plastic vent. It doesn't condense so
> >obviously it's not. I have tested both using flue gas analyss,
> >found they run 75-80%. The power vent needs 120v though, so I lean
> >towards the PV actually being less efficient. Faster recovery time
> >though, lower input...so I dunno , confused...
> >
> >What do you guys think?
> >
> >-CanadianHeat
>
> I didnt know there was a debate.
> Power-vented doesnt save money over atmospheric.
> The power-vented is usually twice as expensive as the atmospheric.
> Go with a tankless.
> .............and No, I dont have one........yet.
> Bubba


Posted by Steve Scott on December 22, 2006, 8:50 am
The endless hot water thing is hype. Any WH can run out of hot water.
A 100kbtuh WH will only deliver a little over 2gpm continuous flow at
a 75F temp rise.

On 22 Dec 2006 05:42:26 -0800, "jamesgangnc"

>Tankless gas is less efficient at heating the water. If the usage is
>infrequent then the savings from not having to keep the water hot
>outweighs that. In a normal household that is not usually the case.
>There is the added advantage of never running out of hot water though.
>
>Bubba wrote:
>> On 22 Dec 2006 04:28:53 GMT, DANgER (danger@heat.com) wrote:
>>
>> >So what do you guys think about the water heater debate? I
>> >constantly get customers who have paid big bucks to have their home
>> >audited and tested for efficiency ect...They tell the customer to
>> >replace their conventional vented water heater with a power vented
>> >one. I think a lot of people assume the power vent is high
>> >efficiency because of the plastic vent. It doesn't condense so
>> >obviously it's not. I have tested both using flue gas analyss,
>> >found they run 75-80%. The power vent needs 120v though, so I lean
>> >towards the PV actually being less efficient. Faster recovery time
>> >though, lower input...so I dunno , confused...
>> >
>> >What do you guys think?
>> >
>> >-CanadianHeat
>>
>> I didnt know there was a debate.
>> Power-vented doesnt save money over atmospheric.
>> The power-vented is usually twice as expensive as the atmospheric.
>> Go with a tankless.
>> .............and No, I dont have one........yet.
>> Bubba


--
Keep your feet close to the ground.





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