Brad Cook
  • Warren, VT
  • United States
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Brad Cook's Discussions

Too many Heat Pump Water Heaters in a basement?

Started this discussion. Last reply by Crista yesterday. 12 Replies

I recently met with the owner of a local rural inn to discuss performing a comprehensive energy assessment for him. He has been looking at replacing his existing propane boiler and three 80 gal.…Continue

BDT with vermiculite in hollow CMU walls?

Started this discussion. Last reply by Jan Green May 11. 20 Replies

We don't have many brick homes around here in central Vermont. I recently visited a one-story ranch home that was built with exterior walls of hollow core CMUs (concrete masonry units), a brick…Continue

 

Brad Cook's Page

Latest Activity

Crista replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
yesterday
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"Hi Mike, it's good to get some feedback from the field, and thanks for confirming Gen 3 is now shipping. Sanden's website still says "coming soon" Re: heat tape... it would be ashame to use heat tape (with COP of 1) to prevent…"
Thursday
Michael Duclos replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"I’ve been looking into Sanden for a multi-family PH near Laconia, NH, ASHRAE 99.6% temp is -3F, about 6800 HDD65F recently.  Single bedroom units, typical occupancy is 1 person, we are planning to use one 80 gal Sanden per four units to…"
Wednesday
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"theoretically, let's say you perfectly isolate the HPWH from a heat source. The HPWH's will eventually cool the air to the point that mold will grow. Here's the math: 30x30x8 = 7200 ft3 x 0.075 lbs/ft3 = 540 lbs of air 540 lbs x 0.24…"
Monday
Ed Whitaker replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"Brad,   I agree with the comments and would add a couple of thoughts. 1st,  any time you use a HPWH in a cold climate, you are using heat generated by your heating appliance. To avoid that you would need to insulate between the conditioned…"
Monday
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"Regarding Sanden... US distribution is fairly new so I imagine they make it easy to set up an account, or would sell direct. The plumber would have to be on board, though. The current model is good to -15F, and the forthcoming Gen3 is good to -20F…"
Oct 14
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"Yes, now that I've taken time to make sure I understand the physics, I'm in full agreement. Consider that with an air-air heat pump or A/C, the heat rejected by the condenser is roughly the same as the heat absorbed by the evaporator. A…"
Oct 14
Dannie Jackson replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"Interesting I have not heard of these types of water heaters out east here, nor have seen them mentioned in any articles on the internet.  Thanks for posting this."
Oct 13
Brad Cook replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"Thanks for the reply, David. The bottom line is that you agree that installing 3 HPWHs in that basement would be foolish. I looked at the Sanden. It is taking its heat from outside, and must be protected from freezing. It is not distributed to…"
Oct 12
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"It' irrelevant whether the basement is intentionally heated now. My point is that if you install 3 HPWH's down there, it makes no sense to NOT intentionally heat it. The heat pumps must get their heat from somewhere. Without a heat source…"
Oct 12
Brad Cook replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"The HPWH model proposed is an 80 gal State, Model HPX80. Estimate propane at $2.30/gal. and electric at $0.15/KwH. The basement is NOT intentionally heated. The existing SlantFin Cat.I boiler will be replaced with a Weil-McLain GV-90, which is…"
Oct 12
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"Hi Brad, as you know, a heat pump's capacity and COP depend largely on ambient temperature. But in situations like this where heat pump operation will have an out-sized impact on ambient, you essentially create a feedback loop. Unfortunately,…"
Oct 12
Brad Cook posted a discussion

Too many Heat Pump Water Heaters in a basement?

I recently met with the owner of a local rural inn to discuss performing a comprehensive energy assessment for him. He has been looking at replacing his existing propane boiler and three 80 gal. electric water heaters and has received a proposal for that from a contractor. That contractor is proposing to install a Weil-McLain GV-90 plus THREE- 80 gal. Heat Pump Water Heaters (HPWHs). The basement (which is only under the original building) is roughly 30' x 30' by 8' high, with a bare 1800s…See More
Oct 12
Brad Cook joined Bob Krell's group
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Healthy Indoors (IAQ)

The Healthy Indoors group is focused on indoor air quality (IAQ), mold, moisture control, radon, lead, air duct cleaning & HVAC hygiene, and building performance/ building science-related topics that affect the healthiness of our indoor environments, like air leakage.See More
Oct 9
Brad Cook replied to Barry L NewDelman's discussion Electro Magnetic Fields (EMF)
"EMFs are everywhere and in varying strengths and frequencies. In my experience a small percentage of the population report that they are very sensitive to EMFs (I have a few such clients). This may be similar to some who are very sensitive to air…"
Jul 27
Brad Cook replied to Brent Shapiro's discussion Investigating 3257KWH monthly usage issue.
"Jason's suggestion my be a quick way to isolate the high load, IF you have an old style meter that actually spins. Many utilities are converting to the Smart Meters that are digital and don't show instantaneous changes in load. At 3257 KwH…"
Jun 24

Profile Information

Company
Building Performance Services LLC
Role in Home Performance Marketplace
Contractor: insulation, Energy auditor / assessor / analyst
Professional Certification
BPI, Home Energy Score Qualified Assessor
Twitter ID
@fixitron
Facebook Page
https://www.facebook.com/Building-Performance-Services-137548512935...
LinkedIn Profile
https://www.linkedin.com/in/brad-cook-66aa0018?trk

Comment Wall (1 comment)

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At 2:59pm on October 12, 2016, Diane Chojnowski said…

Hi Brad,

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.

Thanks!
Diane, HEP Moderator

 
 
 

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David Butler replied to David Butler's discussion How would you insulate this roof?
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Stuart Langley replied to David Butler's discussion How would you insulate this roof?
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David Butler replied to David Butler's discussion How would you insulate this roof?
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20 hours ago
Stuart Langley replied to David Butler's discussion How would you insulate this roof?
"So this building has a few issues with air leaks and air leaks have so much to do with discomfort…"
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Stuart Langley replied to David Butler's discussion How would you insulate this roof?
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