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Larry Weingarten

Larry Weingarten

Joined on August 26, 2003

Last Post on March 2, 2014

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Long ago...

@ September 5, 2012 9:31 PM in Rinnai RU98i only works with cover off

... I had a similar problem with a similar heater.  It turned out the metal cover shorted out part of the control circuitry when it was properly in place.  Have a look around for any wiring that might interfere with the cover.

Yours,  Larry

I'll add...

@ September 2, 2012 11:33 AM in Solar Photovoltiac

... that there is a huge amount of info on all things solar at .

Yours,  Larry

water flow

@ August 30, 2012 3:52 PM in Domestic Hot Water Storage Tank Bank

Hello:  I'm wondering if a positive displacement pump might not be the only way to really control flow through the heat pump units.  If there were a greater pressure differential caused by a water draw, wouldn't that pull more water through the pump than 3gpm?  About serviceability and valves, it really is not hard to run one main overhead, tie into it with hot and cold from the tank and put a valve between those connections to allow you to unhook one tank from the system, even while it's in operation.  I've done this with no problems.  I'm waiting for high COP units to come to residential!

Yours,  Larry

Interesting discussion

@ August 29, 2012 11:41 PM in Domestic Hot Water Storage Tank Bank

Hello:  This is an interesting discussion to me as I like one main benefit of series piping, which is it cannot get out of balance.  The problem of serviceability is dealt with by putting valves on both hot and cold tank lines and running a bypass between them with another valve.  This allows any tank to be taken off line without interfering with service to the building.  Flow loss is a concern.  I'd want to know the maximum draw and make sure the flow path through tanks is not overly restrictive.  Bigger tanks/connections or even more than one string of tanks could accomplish this.  One question that came to mind looking at the diagrams from Colmac (diagram 1) was the possibility of water making up it's own mind about whether to flow through heat pumps or tanks when water is drawn.  This could create temperature problems if the water chose badly.  As piped, it looks like a last in - first out arrangement, which helps to insure you get the hottest water from the tanks.  One other thing is the claim of COPs from 3 to 5.  This is substantially better than two, which is good for residential air to water heat pumps.  Much to consider!

Yours,  Larry

another thought

@ August 27, 2012 2:19 AM in Ruud Monel Water Heater

If it's not leaking and you have a warm place to put it, just use it as a tempering tank to preheat your hot water.  It's a form of recycling that could pay a lot better!

Yours,  Larry

It's not exactly...

@ August 21, 2012 12:43 PM in Horizontal 1500 Gal Solar Storage Tank: Design Suggestions

... what you were asking for, but I'd consider not using a pressurized tank on the roof, but rather an unpressurized, site built, with a liner (or plastic) tank and run a large heat exchanger in it on the DHW side to gather up the available heat.  This is likely more durable and weighs less.  Have all connections leave via the top of the tank, so leakage is never a concern. Them's two cents.

Yours,  Larry

ps.  At a minimum, in a sunny location, I'd want about two gallons of storage per square foot of collector, to prevent overheating.  It looks like you have less than that.

Is their PV system...

@ August 19, 2012 2:05 AM in On-demand with pre-heated hot water

... big enough to accommodate a heat pump water heater?  Run it in heat pump only mode.  Just a thought.



@ August 11, 2012 6:37 PM in More Hot Water:

Hello:  It's fun noticing some of the details, like no scorch marks on the plywood; 45s in the gas line for good flow; the drip leg plumbed so it really works...  I am curious to know how you flashed the vent.  Sounds like working on a ski ramp.

Yours,  Larry

Try a little testing.

@ July 29, 2012 11:51 AM in off topic,plumbing ?

Run only hot water; one, two, three taps and see if/when you get the noise.  Do the same for cold water.  It's a way to narrow down where the problem lives.  Let us know what you find.

Yours,  Larry

I've been looking around...

@ July 27, 2012 1:46 AM in Pipe relining procedures questions.

... for solid evidence of erosion in PVC using clean water and can't find it.  Mix in some sand and it's a different story.  It would be interesting to know if erosion is the culprit.  If so, the system is seriously over pumped!  The only limit to velocity in PVC seems to be hydraulic, water hammer type concerns.  Oops, the water was moving at 20 feet per second and a valve snapped shut!

Jack hammer surgery! ... It's an image :~)

Yours,  Larry

ps.  Is the pipe laid in rocky soil?  Maybe it moves enough for sharp rocks to abrade through from the outside.

Do your buffer tanks...

@ July 27, 2012 12:36 AM in Glycol blues what a mess

... have anodes in them?  (glass lined steel tank)   If so and if they are aluminum anodes, that could be the source of the trouble, if plumbing permits water from the bottom of the tanks out into the system. 

Yours,  Larry

Looking at the photo...

@ July 27, 2012 12:29 AM in chances of galvanized water line failing

... I see the back of the "T" had a spot where it was weeping a touch.  You did the right thing replacing it.  It would have been interesting to see the condition of the pipe at the brass valve connections.  If you really are responsible for pipe on the utility side of the meter, insurance sounds like a good idea!

Yours,  Larry

It might be time...

@ July 25, 2012 11:32 AM in Foreclosure Questions / Checklist?

... to sit down and make lists of all the pros and cons with this house so decision making is easier.  I'd also look at the historical value and replacement cost of the home.  I'd put on my investor's hat and look to see if it was a sound investment offering a decent return based on rent.  I'm of the mind that what doesn't kill you makes you stronger, but don't really know how many of my lives I've used up....  Congratulations!

Yours,  Larry

In California...

@ July 25, 2012 11:17 AM in chances of galvanized water line failing

... where I am, the homeowner is responsible for everything downstream of the water meter and sewer right up to the to the main line. Steel pipe is supposed to have a service life of fifty years, but I see it lasting 80-100 years and still delivering water in places that have good water like San Francisco. If you have not so good water, or difficult soil, it can fail in ten years.

In your case I'd take a walk up and down the road and look for clues of excavation in the street to see how many have been done recently.  If everyone on the street has had the water main replaced but you, I'd keep the insurance!  :~)

Yours,  Larry

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
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