Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Can of worms...

Options
13»

Comments

  • Charlie from wmass
    Charlie from wmass Member Posts: 4,322
    Options
    I learn from many things. Data from reliable sources is my favorite thing to learn from. Single speed pumps are great for boilers piped to systems with hydraulic separation from the heat emitters. I also like single speed for indirect water heaters. The rebate is nice though. I sell things that work. I do not throw in things. I factor in my costs and a profit. I am pretty sure that is how business works.
    Cost is what you spend , value is what you get.

    cell # 413-841-6726
    https://heatinghelp.com/find-a-contractor/detail/charles-garrity-plumbing-and-heating
  • Rich_49
    Rich_49 Member Posts: 2,766
    Options
    Single speed pumps are just fine for IDWH's . Acceptable for boilers too , that's probably why most mod cons have S & R sensors to know at what rate to fire .

    You didn't get what you didn't pay for and it will never be what you thought it would .
    Langans Plumbing & Heating LLC
    732-751-1560
    Serving most of New Jersey, Eastern Pa .
    Consultation, Design & Installation anywhere
    Rich McGrath 732-581-3833
  • Paul48
    Paul48 Member Posts: 4,469
    Options
    Let's be clear.....Those would be sources that you "believed" to be reliable. Charlie....You have small children......I'm sure you've noticed that they will ask you "why" in the middle of a group of 50 people. They don't care, they want to know. It's only when we get older, that we will no longer do that, for fear of ridicule.
    Rich_49
  • Charlie from wmass
    Charlie from wmass Member Posts: 4,322
    Options
    my kids are told to save their questions. Then I take the time to answer them in depth. I am just saying this is a debate about nothing as the result is, with proper engineering, the same. In order to maintain a given DT you need to slow the pump rate to allow for the heat emitters to drop the heat, to adjust with a DP you slow the pump rate to match the resistance to given parameters. In doing so you increase the DT as compared to a set speed pump through the same zone. In practice a DT pump gives a DP and a DP pump gives a DT. To confuse things if we use indoor and outdoor resets we make DP or DT pumps and zoning unnecessary. Like the constant circulation systems. If we have a system that runs every zone all the time and simply adjusts the feed rate of b.t.u.s into the mix would that not be more efficient?
    Cost is what you spend , value is what you get.

    cell # 413-841-6726
    https://heatinghelp.com/find-a-contractor/detail/charles-garrity-plumbing-and-heating
  • Rich_49
    Rich_49 Member Posts: 2,766
    edited March 2015
    Options
    Charlie , it is not possible for a Delta P pump to insure a specific Delta T . If thsi were not the case Grundfos and Wilo , for instance would have no need to offer an additional sensor to make their Stratos and Magna circs capable of Delta T setpoint .

    It is however possible for a Delta T circ to vary flow and as we all are aware with various flow rates through the same circuits so will change pressure . At least that is what I thought quite awhile ago .
    You didn't get what you didn't pay for and it will never be what you thought it would .
    Langans Plumbing & Heating LLC
    732-751-1560
    Serving most of New Jersey, Eastern Pa .
    Consultation, Design & Installation anywhere
    Rich McGrath 732-581-3833
  • Paul48
    Paul48 Member Posts: 4,469
    edited March 2015
    Options
    I haven't seen him in a while, but I think Jean-David Beyer encountered this problem with a DT circ. Oh, and he took a lot of heat for saying he got more heat pumping faster. He has an over-sized mod/con and was trying to minimize short cycling.