Rod Fox
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  • Cerrillos, NM
  • United States
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Does calcification affect electric water heater aquastat temperature sensor performance?
13 Replies

I recently ran across a situation where a 40 gallon electric water heater was cycling on and off every five minutes or so. While monitoring that circuit, it would kick on for 4-5 minutes and then…Continue

Tags: sensor, calcification, temperature, aquastat, water

Started this discussion. Last reply by Rod Fox on Thursday.

Does altitude affect AFUE? or just the input/output BTUs?
25 Replies

I searched and searched and searched yesterday for an answer to the question "Does altitude affect AFUE?" but did not come up with any definitive answers. Hopefully this discussion will answer that…Continue

Tags: derate, input, BTUH, altitude, SSE

Started this discussion. Last reply by Morgan M Audetat Jul 15.

Utility company's diabolical rate plans don't save the consumer equivalent to what they conserve
6 Replies

Attached is a spreadsheet I created for a restaurant client comparing two plans and projected kWh savings at 20% and 30%.Currently, they are on the rate plan "3B". If they were to remain on this plan…Continue

Tags: savings, vs, actual, plans, rate

Started this discussion. Last reply by Bud Poll Aug 13, 2012.

Efficiency First Membership Pricing
4 Replies

Does anyone else find the $300 membership fee a bit rich for a business consisting of only one self-employed owner?At $100 I might consider it, but at $300 they've pretty much prevented me from…Continue

Tags: overpriced, membership, first, efficiency

Started this discussion. Last reply by Rod Fox Jul 26, 2012.

 

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Rod Fox replied to Rod Fox's discussion Does calcification affect electric water heater aquastat temperature sensor performance?
"We're in climate zone 5 (near Santa Fe, NM) where it's dry as a bone. Gonna head to that client's home tomorrow with a new arsenal of testing... Thanks everyone who responded. I really dig this home performance community."
Thursday
Bud Poll replied to Rod Fox's discussion Does calcification affect electric water heater aquastat temperature sensor performance?
"The two 4500 watt elements will never operate simultaneously.  It will be one or the other.  A simple volt meter will tell you which one is on and you should be able to run off some water and check to see if it transfers from one element…"
Thursday
Rod Fox replied to Rod Fox's discussion Does calcification affect electric water heater aquastat temperature sensor performance?
"Correction to this last posting... This model only operates one element at a time, not two in tandem. When the top thermostat is satisfied, then it shuts off and turns on the lower one until that thermostat is satisfied. Each one consumes 4500 watts…"
Thursday
Rod Fox replied to Rod Fox's discussion Does calcification affect electric water heater aquastat temperature sensor performance?
"Agreed. Incidentally, I just called tech support at Bradford White (and actually spoke to a knowledgeable human!), giving him the information that I've collected thus far and his response was that the only reasons a hot water heater would be…"
Thursday
Hans Joachim Preiss replied to Rod Fox's discussion Does calcification affect electric water heater aquastat temperature sensor performance?
"Rod, Because the tank is not overheating, the behavior is either normal for this tank or there is a leaking hot water faucet.  Hans "
Thursday
Rod Fox replied to Rod Fox's discussion Does calcification affect electric water heater aquastat temperature sensor performance?
"Hey thanks Hans. I didn't know about the benefit of the heatpump units having the elements wrapped around the tank, thus reducing the temperature differential and less chance of limescale buildup. Thanks for that! And yet another reason for…"
Thursday
Rod Fox replied to Rod Fox's discussion Does calcification affect electric water heater aquastat temperature sensor performance?
"I'm not sure if the tank was flushed at the time of element replacement. I would have hoped so, but the quantity of lame plumbers around here doesn't give me much confidence.Pipes are either buried in the slab or under the slab. Bud, your…"
Thursday
Rod Fox's discussion was featured

Does calcification affect electric water heater aquastat temperature sensor performance?

I recently ran across a situation where a 40 gallon electric water heater was cycling on and off every five minutes or so. While monitoring that circuit, it would kick on for 4-5 minutes and then shut off (behavior I would consider normal). Shortly after (within 5 minutes of so), it would turn on again for 4-5 minutes. During this time there was no need for heat (based on no hot water being used). It does this all day long. The client informed me he had both elements replaced 6 months ago. He…See More
Thursday
Hans Joachim Preiss replied to Rod Fox's discussion Does calcification affect electric water heater aquastat temperature sensor performance?
"Calcification happens on the heating elements because hardness causing minerals are less soluble in hot water than in cold water. Lime scale typically causes heating elements to overheat and fail. The aquastat that senses water temperature and turns…"
Thursday
Bud Poll replied to Rod Fox's discussion Does calcification affect electric water heater aquastat temperature sensor performance?
"The comment that they are running high electric bills may or may not be related to the cycling.  But the cycling may be a symptom rather than a cause since the efficiency of an electric water heater is not really affected by the cycling. …"
Aug 26
Sean Lintow Sr replied to Rod Fox's discussion Does calcification affect electric water heater aquastat temperature sensor performance?
"Actually there are generally 2 elements which would both pull 4500 so 9000 (unless you are saying there are 2 - 2250w elements) - the bottom one is the one that gets the most usage with the other one only coming on approx. 1/3 of the…"
Aug 26
Rod Fox replied to Rod Fox's discussion Does calcification affect electric water heater aquastat temperature sensor performance?
"Thanks Bud and Sean. They do not have a recirculating system at all. And when the tank turns on, it's pulling the full 4500 watts, which would indicate to me that both elements are heating up at the same time, which just got me thinking,…"
Aug 26
Sean Lintow Sr replied to Rod Fox's discussion Does calcification affect electric water heater aquastat temperature sensor performance?
"Do they have a recirculating system running full time or occupancy center type? Calcification of the elements generally results in degraded performance though I guess it could be overheating causing it to trip (wild guess - not sure they are set up…"
Aug 26
Bud Poll replied to Rod Fox's discussion Does calcification affect electric water heater aquastat temperature sensor performance?
"Hi Rod, not a pro on this, but I'll get the discussion going. Do you know which element is cycling? Did they flush the water heater when they replaced those elements? How long does the short cycling last?  Even one good element will…"
Aug 26
Rod Fox posted a discussion

Does calcification affect electric water heater aquastat temperature sensor performance?

I recently ran across a situation where a 40 gallon electric water heater was cycling on and off every five minutes or so. While monitoring that circuit, it would kick on for 4-5 minutes and then shut off (behavior I would consider normal). Shortly after (within 5 minutes of so), it would turn on again for 4-5 minutes. During this time there was no need for heat (based on no hot water being used). It does this all day long. The client informed me he had both elements replaced 6 months ago. He…See More
Aug 26
Morgan M Audetat replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Dale and I are referring to high efficiency condensing boilers designed to recover the latent heat of vaporization in a secondary heat exchanger designed for acidic condensate and capable of the highest combustion efficiency available in a gas-fired…"
Jul 15

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Advanced Metrics Group
Professional Certification
BPI Building Analyst Professional
Professional Interests
Renewable energy systems
Simplification
Website URL
http://www.amgi.net
LinkedIn Profile
http://www.linkedin.com/pub/rod-fox/15/8b7/871

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At 1:03pm on January 4, 2011, Diane Chojnowski said…

Hi Rod,

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the
place for you!

Don't forget to upload your profile photo. And, add your location on our Member Map!

Thanks!
Diane, HEP Moderator

 
 
 

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