Dan Antonioli
  • Oakland, CA
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Dan Antonioli's Discussions

Net Zero Energy Hot Water

Started this discussion. Last reply by Tom Mallard May 12. 18 Replies

I'm about to invest in a new hot water heater. I have grid-tie solar and was planning on installing an 80-gallon solar thermal electric hot water tank. It has one 4,500 watt heating element on the…Continue

Best Insulation For Older Building With Potential Moisture

Started this discussion. Last reply by Roy L. Miller Mar 27, 2014. 8 Replies

I have an older redwood sided home that has the siding nailed directly onto the framing. There's a layer of felt paper over the framing, but it hardly qualifies as a "moisture barrier" by our modern…Continue

Wooden Plugs For 2" Insulation Holes

Started this discussion. Last reply by tedkidd Apr 20, 2012. 18 Replies

Our operation, Rising Sun Energy Services, insulates a lot of walls using cellulose blown in through 2" holes. As simple as a tapered 2" plug might be, we've been having a very hard time sourcing a…Continue

 

Dan Antonioli's Page

Latest Activity

Tom Mallard replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Earthship's have been doing solar-thermal water for several decades they recommend a 150-gallon tank as usage hardly effects it, they use a brand with solar-thermal elements and their backup is an inline on-demand heater as it's rarely…"
May 12
Dan Antonioli replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Rick, see my reply above."
May 11
Rick Causo replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Dan, have you given thought to capturing the waste heat energy from the hot water going down the drain? Take a look at our DWHR, especially if you're in northern climate, as this unit re-heats cold, incoming water to help the efficiency and…"
May 11
Rich Manning replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Thanks Dan for the information! Education sure helps"
May 9
Dan Antonioli replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Daniel,  Several years ago I was researching two different systems, one of which I almost invested in as a distributor...but the economy was sinking, the company I think went out of business, and I haven't really considered it since…"
May 5
Dan Antonioli replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Rich, it always depends on site conditions, but generally speaking the 80% figure is a common reference.  There are also some sewed statistics for solar thermal where efficiency is counter-intuitive. In Alaska solar thermal works really well…"
May 5
Daniel Beauchemin replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Dan Antonioli, You can use a ThermoDrain, drain water heat recovery to preheat your water and reduce the size of your hot water heating system. These are passive water heaters that use waste water to preheat cold water before being heated. For…"
May 5
Rich Manning replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"80% seems a little  high to me for the solar system. Typically one would size the system to cover the summer load. It would be interesting to see your reasoning."
May 5
Dan Antonioli replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Okay, a couple of things. The 1.0 kW per square meter reference is only under the most ideal lab conditions. Solar thermal is 85% efficient...when running...so I'm not sure how the no-running part of the equation is factoring into the rating…"
Apr 29
Hans Joachim Preiss replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Dan, Let me attempt to compare apples with apples: My solar thermal system is located in Massachusetts. Over 6 years it produced 10,847 kWh of hot water according to the BTU meter I have installed. That's an average of 4.9 kWh per day. There…"
Apr 29
Dan Antonioli replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Hi Hans, I don't know where you're located but where I am a 2.5 kw pv system costs closer to 12k. We have to factor in costs such as each roof needing an engineer's stamp before the local building departments will sign off on it,…"
Apr 29
Hans Joachim Preiss replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"I use the combination of solar PV and heatpump water heaters in the vast majority of net-zero energy homes I design HVAC and DHW systems for. I used to be a huge fan of solar thermal and installed a system on my own house, but since the price of PV…"
Apr 29
Dennis Heidner replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Dan, Solar PV and solar H2O work in northern climates...They can still provide the desired goal in cool areas.  But the Heat Pump Hot Water Heater option may be a problem if you are trying to use one in a climate zone 5 or above.  It may…"
Apr 28
Dan Antonioli replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"For my particular application the heat pump heater would be integral to the tank and thus be blowing cold air inside the entryway of the back of the house. The entryway can be enclosed by the three doors connecting to it, but it will still…"
Apr 28
Dennis Heidner replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"What climate zone are you in?  Where would the hot water heater be set?  Northern climates with a heat pump in a cool/cold room can be counter productive.   Place the same HPHW inside a house in a hot humid climate and you may see…"
Apr 28
Larry Weingarten replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Hello:  Looking for solid numbers,you might want to search "Martin Holladay solar thermal dead".  He's written two articles on this. The first one is "Solar Thermal is Dead" and the second one is "Solar…"
Apr 28

Profile Information

Company
Dan Antonioli Construction
Professional Certification
Licensed General Contractor, Certified Green Builder, Certified Permaculture Designer, Ecovillage Developer
Professional Interests
All things green and sustainable.

Comment Wall (3 comments)

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At 12:08pm on June 13, 2013, Jim Gunshinan said…

Hi Dan,

I don't remember presenting at Build It Green. Maybe at ACI national a few years back? Hope you still want to "friend" me!

At 8:36am on March 6, 2012, Michael D'Orazio said…

Hello Dan,

I am a member of Home Energy Pro's site and have found it to be a great resource.  I have been around the energy industry and have new social media website focusing on energy conservation: www.greenplug.nu

Im reaching out ot members who already share the same interest as Green Plug District will focus on.  We have a founders page up and looking for pepole to join for free create a profile and start adding content at: http://w321503.s182.ufhosted.com/gp-forum/

At 7:30pm on January 31, 2012, Diane Chojnowski said…

Hi Dan,

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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