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.

reset #'s

kevin coppinger_4
kevin coppinger_4 Member Posts: 2,124
in THE MAIN WALL
does anyone have some solid or semi-solid numbers to how much annually one could save in a radiant job using injection w/ partial reset over just using a mixing valve to mix down the water temp.(ie Taco pc705)I have to answer this question every once and a while I can give the customer any hard numbers...I can see it being a big savings in a tube-in-slab job(temp 110F) but am wondering about the saving more in a staple up/dry application(temp 140F) Any thoughts? kpc

<A HREF="http://www.heatinghelp.com/getListed.cfm?id=323&Step=30">To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"</A>

Comments

  • S Ebels
    S Ebels Member Posts: 2,322
    Good question Kevin

    Buderus' literature claims that numbers as high as 20% are realistic given the same system running with vs. without reset. I myself have never had the opportunity to install a reset control on the same boiler in the same system, same house scenario so I can't give you real numbers.

    The thing to remember is that the Euro boiler guys directly reset the boiler down to just over 100* in the case of Buderus. This is much different than letting the boiler run at 160+ and resetting the water temp only. Figures I've heard tossed around by Viessmann's engineers are 1% savings for every 3 degrees below 140 boiler water temp. In other words if you're averaging 120 vs 140 you're going to save 6%. If you're at 110 average look for 10% reduction in operating costs. Again, it's very important to understand that these number don't mean anything if you're just resetting the water temp with a mix valve or injection and still running the boiler "hot".

    Thanks for the e-mail on the van!!
  • Unknown
    Unknown
    well

    We had a client who retrofitted some reset to a six zone baseboard only system, and saw about a 20% energy savings from that.

    So we usually say 10-20% as a range, not a promise. I think it's probably at least that good for a radiant system, but we don't retrofit many control systems, it's all new installation or full system retrofits, so it's hard to pull quantifiable data on it.
    _______________________________

    Northeast Radiant Technology, LLC

    Robert Brown, Co-Owner, RPA certified Radiant Designer

    207.899.2328
    NRT@maine.rr.com
This discussion has been closed.

Categories