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Burnham V7

bill_105 Member Posts: 429
Is there not a heat  exchanger cracking issue ?


  • BobC
    BobC Member Posts: 5,401
    Yes but

    It's not universal. That block had flaws but some did survive a good while.

    I replaced my v75 after 16 years because it was much to big and i was switching to gas. The sections looked pretty good when they dismantled it but I had always been pretty careful with that boilers care and feeding.

    Smith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
    Vaporstat with a 12oz cut-out and 4oz cut-in
    3PSI gauge
  • Paul Fredricks_3
    Paul Fredricks_3 Member Posts: 1,557

    I've had my V74 for a while now with no issues. It is a bit oversized so I have it down fired and the aquastat is set to 110° - 160°. Thermal change kills these, so anything to limit that helps.
  • billtwocase
    billtwocase Member Posts: 2,385

    thermal shock never was an issue with V-1, or even when they were American Standards
  • icesailor
    icesailor Member Posts: 7,265
    edited February 2013
    You mean like this?

    You mean like this?

    I found this the other day. The first boiler went in in 1992 or 1993. It was replaced around 2000 because of the crack. I found this last week. The house water is drained but the heat is still on with no antifreeze in the system. The caretaker is in Florida and the house ran out of oil and sooted up around the end of December. Someone came to stay in the house and found it cold. The installer has a funny way of wiring boilers. The circulator and zone valves all stay open even when the burner is locked out. The circulator running picked up heat from other areas of the house and it didn't freeze or break during the cold down in the teens. The oil deliveries told the tale.

    When I cleaned the soot plugged boiler, I found the new crack.
  • Steamhead
    Steamhead Member Posts: 15,987

    for a 3-pass if you're staying with oil.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
  • icesailor
    icesailor Member Posts: 7,265
    Cold Shock

    In my opinion, a 110 degree operating temperature and a 160 degree high limit is a cold start boiler with almost maximum shock. With maximum creation of Kibble And Bits inside. Uhm. Fun to clean.
  • Ron Jr._3
    Ron Jr._3 Member Posts: 603
    I was told

    from someone from Burnham the problem with the V7 was the internal part of the sections near the cleanouts were too square , the edges were too jagged , and water moving past them made turbulence and caused them to leak .

    A few days ago we were at a Levitt house to turn V74 180 degrees for easier access vunder the stairs . Saw it was leaking near the cleanouts . We told the customer and she decided to have us do the job anyway . Water was spritzing out at 20 psi so we knocked it down to 5 psi and it stopped . The good thing is..... once she has no choice but to get a new one we'll install the right size !
  • billtwocase
    billtwocase Member Posts: 2,385
    too square

    Ron, I'm thinking that the rep that told you that was also square. Even had V-8 leakers. Just poor and too thin of a casting. Like I said before, that was originally an American Standard boiler when Burnham bought them out and became Burnham-America. Never had a problem with the early "V" series boilers, and the design has remained the same right thu to top the 8, besides swing out burners, and improved clean-out access. Too bad a lot of them didn't show up until the blocks were into the 10th thru _ part of the warranty period. Sorry, can't help you. 
  • Ron Jr._3
    Ron Jr._3 Member Posts: 603
    edited March 2013
    Yep , I agree

    the casting near the cleanouts is too thin and probably the cause of all the V7 leakers . But we've installed probably a few thousand V8s in about a decade and maybe replaced a handful of leakers . I changed one out that was leaking at the push nipples . Only time will tell for the V8 line ...... 
This discussion has been closed.