Recent content by hlv

Thanks for the replies. Dana, your comment suggests that increasing the delta T on the primary loop would increase it in the radiation zones, but is this necessarily the case? Can’t the flows within primary and secondary loops operate at rates to maintain a higher delta T on the primary loop...

I'd like to clarify that there are no problems or comfort issues with the system, nor short cycling; I'm just interested in optimizing condensing efficiency, within the limitations of the existing distribution system. The distribution system is 140' of finned tube baseboard (mostly 30 years...

Last fall I had a new modcon boiler serving two fin-tube baseboard zones. I have a couple questions regarding the current circulator pump set up and whether it could be improved. The system is a Lochnivar Knight WH55 boiler with Grundfos pump (UPS15-58FC) on the primary loop and a BumbleBee...

When it looked like my preferred contractor would not be available to install the Lochnivar Knight boiler in time, I solicited a proposal from my own plumbing and heating contractor. He likes Utica, so I directed him to the Utica SSC line and their indirect tank. He is not experienced in mod con...

Dana, Thanks for the radiator tips. So the radiator made in Haverhill, Mass. is the pricey euro-style one and the one made in Italy is the cheaper, hum-drum alternative? Go figure. I didn't realize that zones could be run at different temperatures. What happens when zones that normally run at...

Thanks for the replies. You've convinced me not to be concerned about an indirect priority zone on a boiler sized to heat load! I still have a question about determining the minimum fire rate desirable - for example, whether a 10 MBH vs 17 or 20 MBH minimum fire rate matters in my case...

I'm planning to replace my 33-year old natural gas Teledyne-Lars boiler with a high efficiency unit, to take advantage of Massachusetts' early boiler replacement program rebate, and because it doesn't seem worth throwing money at it to fix the noise (flashing?) issues which have worsened over...