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The Wall
Larry Weingarten

Larry Weingarten

Joined on August 26, 2003

Last Post on August 27, 2014

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Recent Posts

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I'd be curious...

@ July 24, 2012 12:57 PM in Pipe relining procedures questions.

,,, to know why the PVC failed.  Did things shift and crack the pipe, bad glue joints, too much heat?  Can the cause be corrected?  Also, what flow really is needed?  Possibly 1.5" pipe could be slipped into the 2".  Use PEX,  It'll take more extreme conditions than PVC.  Yes, I know it's not really an answer to your question  :~)

Yours,  Larry

Have a look...

@ July 14, 2012 2:20 PM in o ratchet

... at this discussion.  Someone selling his.

Yours,  Larry

I just did...

@ July 14, 2012 2:03 PM in Solar thermal website

... and it looks like a good resource.  Thanks!

Yours,  Larry

What sort of...

@ July 8, 2012 6:04 PM in Small 4-Plex super insullated - Best cost-effective way to heat units

... water heater are you planning on?  It's likely that your water heating load will be bigger than the space heating load, so you could use the water heater do do both.  A fan coil or other hydronic approach could work.

A side note:  I'd consider flipping the bath plumbing walls so they are back to back.  This would move pipes off of cold walls and reduce plumbing length, possibly giving hot water faster.

Yours,  Larry

ps. if you can get to one of Affordable Comfort's conferences, it will be worth your time.
pps.  Separate metering will encourage conservation by your tenants.  Not doing it will encourage waste.

I'm not sure...

@ July 1, 2012 1:06 PM in Change Moniker?

... how many Dougs there are on The Wall, but certainly you must be the Main Doug!

Yours,  Larry

you might also look ...

@ June 17, 2012 1:49 AM in Can a oil burner pump be used for water?

... at peristaltic pumps.  They don't much care what fluid you pump as long as the right tubing is used.

Yours,  Larry


@ June 17, 2012 12:59 AM in gas lighting

... still makes gas lights.  They use a mantle rather than open flame.  The same company used to make rather nice water heaters!

Yours,  Larry

A presentation...

@ June 11, 2012 10:27 PM in US to add large tariff to Chinese solar panels

...that was just given at the ACEEE Hot Water Forum in Berkeley CA talked about Chinese solar and what it costs vs US solar.   Also here is a link to the presentations from the conference.  There is LOTS of good info!

Yours,  Larry

I snooped....

@ May 27, 2012 12:52 PM in MasterMaid Tankless adjustment

... all over the internet trying to find your heater, but no luck.  The only interesting thing I found was the President of Ecuador trying to ban gas water heaters!  Could you post photos of it, both the outside and inside?  That will make it easier to respond. 

Yours,  Larry

A problem...

@ May 12, 2012 7:28 PM in OWNER

...Ive seen fairly often in the field is the imbalance mentioned in the first post, where one tank goes cold long before the other one does.  Dielectrics contribute to the problem by obstructing flow with rust inside the pipe.  A slight flow imbalance, which can happen over time, forces hot water delivery performance to suffer even when it was correctly plumbed in the first place.

I don't see it as an either/or situation, but simply different techniques available to us to use where and when they make best sense. 

Yours,  Larry

teflon vs electricity

@ May 12, 2012 10:28 AM in Copper to steel/iron in a closed loop system

Icesaiilor: I've had the same discussion for years, people telling me sacrificial anodes won't work if I use teflon to install them.  My (cheaper) meter tells me there is very little resistance across the joint.

The TV plumber must have been watching his image in the monitor when applying teflon.  That must be why he put it on backwards.  Must be!  :~)

Yours,  Larry

So I must ask.

@ May 12, 2012 10:13 AM in OWNER

If flow has been taken into account and if temperature is adjusted in the tanks to balance the heating each one must do, what is the problem with series plumbing?

Yours,  Larry

water heaters...

@ April 12, 2012 11:55 PM in expansion tanks on DHW systems

... cause thermal expansion.  So you're dealing with the difference between say 50 and 120 degrees and the volume of the heater and hot side piping.  If the inlet is blocked with a back-flow preventer, pressure reducer or check valve, there is a real need for an expansion tank or a relief valve set only a little higher than line pressure.  If it's not there, all the plumbing in the house gets stressed, not just the hot side. We like to avoid stress!

Yours,  Larry

ps.  Icesailor is plenty articulate or he would not have used such a word  :~).

Martin Holladay admits...

@ March 25, 2012 12:56 AM in Solar Thermal is Dead

... his title is intentionally provocative.  He's a smart and caring guy who does far more than just theorize.  Still, the argument is made with assumptions.   He assumes heat pumps are now all grown up.  The info I've seen both in terms of measured performance and field experience suggests something more like a youngster who isn't all that coordinated. 

He assumes conventional solar design which ignores the newer "simple solar" ideas out there which have few, if any moving parts and little to corrode or even maintain.  Steve Baer summed it up nicely years ago when a black painted trash can was "raced" against a fancy solar system and won.  There is room in the marketplace for solar that is designed to catch the low grade heat.  The ideas exist. With elegant design, we can do much better.

Mark Twain put it best: "The reports of my death are greatly exaggerated."

Yours,  Larry

Another approach...

@ March 21, 2012 12:26 AM in Efficiency funding for steam heating bias...Its time for change!

... is to become active in ASHRAE or other body that affects code.  The National Renewable Energy Lab is in process of updating their standards  Attending Affordable Comfort, which is happening very soon in Baltimore will surround you with people from all walks with similar concerns, who might be able to help. 

But, I do like HISSED!

Yours,  Larry

I have a GFX...

@ March 15, 2012 1:28 AM in Kitchen Drain Waste Heat Recovery

... in my shower drain and know it does some good.  In this case after taking care of grease, I wonder about timing.  You're trying to use waste heat from dishwashing, presumably to clear snow from a sidewalk for your patrons?  So, they had to walk through snow to come get fed to make dirty dishes to be washed to clear the sidewalk.  Perhaps two systems are needed, one to initially clear the walk and dishwashing to keep it cleared.  Might be easier/cheaper to put the heat back into DHW.  I'm making too many assumptions!

Yours,  Larry

Trying to narrow it down.

@ March 15, 2012 1:09 AM in Cloudy hot water

Hello:  I don't understand the cloudiness being in both hot and cold.  Apart from that, a few thoughts/questions.  Does the cloudiness clear from a glass after a minute or so?  This tells us if it really is a gas in the water.  Does it only happen on first draw in the morning, or is it still cloudy even on the second and third draws?  This indicates the gas is or isn't finding a high spot in the piping to hang out.  It also, is a clue about the gas being generated slowly overnight, or not.

A hypothesis to check is whether the anode is involved.  Removing the rod for only a few days and putting a plug in it's place will show whether or not the amount of gas at the tap is reduced or stopped.  If it is, you know the anode is involved.  There's some homework  :~)

Yours,  Larry


@ March 11, 2012 1:21 PM in Bad JuJu ?

In the original post there are three things I'll comment on.  First the anodes. They sound like aluminum.  Change to magnesium to get rid of the excessive corrosion byproduct.  Next, the stuff is getting to and clogging the faucets.  Is there a recirc line that doesn't have a working check valve?   Third, you say the bonding wire goes to earth.  Does it all tie into a single grounding rod connected to the main panel?  With multiple grounds, you can get resistance in/through the earth giving you grief.

I agree with icesailor about bad neutrals.  They are tricky AND dangerous.  I've looked into an old style meter box made of aluminum, to find steel screws and copper wire, all wet from a leaky weather-head for years.  Verrrry messy!

Yours,  Larry


@ March 11, 2012 12:15 AM in Attaching Solar to 12" SIP Panels

Hello:  I've done exactly this.  The SIPS panels I was working on were four feet wide with truss joists between them.  I used 1" floor flanges and set two lags into the joists.  From there came up with 1" galvanized pipe and put a roof jack around each one.  If you have greater spans or no joists, it becomes a different story.

Yours,  Larry


@ March 11, 2012 12:05 AM in Cloudy hot water

Hello:  It looks like air.  Does the water clear after sitting a bit?  Tiny air bubbles will float out causing a bit of fizzle on top of the water.  If so, there is air/gas in the water and possibly the plumbing is such that it collects in the line to the kitchen.  After running water for a while, does the next glass you fill still have the cloudy water? 

A possible source of this could be an overactive anode.  Is the water treated in any way?

Yours,  Larry

I really like...

@ March 4, 2012 1:28 PM in trageser copper core custom water heater

...keeping old heaters going.  Have you tried to find out exactly where the leak is?  If it's from a fitting, it's probably fixable.  If from the tank, it MIGHT be fixable.

Yours,  Larry


@ January 29, 2012 1:38 PM in Just saying Hell0 - Mad Dog

Thanks for checking in!  I've missed your straight talking ways.  So, perhaps you can help us find Weezbo and we can enjoy some truly animated discussions  *~//: )

Yours,  Larry
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