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  1. Thanks

    Thanks for the advice. I think you are right about the feed water. San Francisco averages around 60 and ranges from 8 to 140, so I can see what you mean about the fluctuations.
  2. Agreed. I've scoured the system and I can't find...

    Agreed. I've scoured the system and I can't find any. They may have been fixed when the boiler and near boiler piping was completely replaced. When I checked the water last weekend, it was still...
  3. I do have a dedicated return line. The hot from...

    I do have a dedicated return line. The hot from the DHW tank splits into 4 parallel circuits, then merges to a single 3/4 return. There are not check valves or balance valves in the 4 branches, so...
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  5. I've had some more time to examine the mixing...

    I've had some more time to examine the mixing system. It does indeed seem to be water hammer on the cold line, which is induced by fast closing of sink or other fixtures that utilize the hot water...
  6. What is the best value 80-100 gallon tank for storage/buffering?

    I don't need a stainless tank and don't want to break the bank. The American Water Heater SE62-119R-045S looks ok:

    http://www.americanwaterheater.com/products/pdf/lsst10.pdf

    I was originally...
  7. Thermostatic Temp Control of Water Recirculation

    Does anyone know of US available parts like this temperature controlled valve for water recirculation? I have a 4 branch DHW recirculation system that was never setup with balancing valves. I'd...
  8. Boiler System Cleaning Agents - Which One?

    Background: Our condo building hydronic heating system was essentially neglected for 10 years before I came around. About a year ago our Ergomax reverse indirect and cast iron boiler were replaced...
  9. Pulsed Power Water Treatment - Does It Work?

    Hi all, I've been reading about pulsed power water treatment. Apparently, the technique has been used successfully in some California water utility pilot tests to descale cooling towers. Has anyone...
  10. Update

    Hi Jim, I confirmed that the expansion tank connection is between the cold input check valve and the cold supply to the DHW tank. I was really hoping this was going to be the solution.

    I...
  11. Water Hammer After Powers MM430 Tempering Valve Install

    Hello, I installed a MM430 to temper the water stored in a Triangle Tube Smart 80 gallon tank. The previous tank and tempering valve did not have any noticeable noise. I don't have a sense of the...
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    Boiler System Advice Request

    Hi all, I would like your feedback on the system outlined in the attachement. Background: the system here heats a 12 unit condo complex in SF, CA. The heating loads are a mix of hydronic baseboard...
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