low mass boiler

Brad White_184

Seriously, start with a calculated heat loss and an assessment of your radiation. The comparison between these two is key.

What I am getting at is to incorporate any and all insulation, windows and envelope improvements made over the years (as one would hope and if not, why not?)

My concern is that you want to know for certain that you can operate a lower temperature boiler (forget about high or low mass for a moment here). If you need the hotter water, make sure that the boiler can deliver it.

If the structures have been insulated, you can likely heat the spaces using cooler water temperatures.

Now, the mass. High or low mass has nothing to do with "keeping up". That is a function of input versus output. Low mass responds faster and has a lower water content so control and guaranteed boiler flow is essential. This is where P/S piping comes into play, with the boilers having their own circulators and different system-side flows.

Higher mass CI boilers are more forgiving but take longer to heat up.

baby wet head

low mass boiler

i am replacing an old dinosaur of a boiler in an older colonial home which provides heat for the main house, an attached apartment and two apartments across the driveway above the garage. i want to put in a weil-mclain ultra series 2 310 and completely replace the piping to install a primary/secondary system, no dhw involved. im not sure however if the low mass boiler will keep up with demand, i have not worked with these boilers much. until lately i have always relied on the burnham cast iron lower effeciency models.

hot_rod

consider a hydro separator, also

I think they offer some nice advantages to "site built" primary secondary piping.

Here is a link to a pdf file with some good design data and explanation of their use.

http://www.caleffi.us/en_US/caleffi/Details/Magazines/pdf/idronics_1_us.pdf

hot rod