One pump , no "hydraulic" separator, all the math done up front. We could design a system for you for less than the seldom needed hydraulic separator (an appliance that inevitably raises the return water temperature) will cost installed
I haven't done much research on the separator, but my mechanical consultant (who speaks broken english, so I gather he meant to say "hydraulic" not "hydronic) suggested it to reduce the floating particles from my cast iron rads clogging the HX. Is this the intention for the separator or am I losing something in translation? If I don't need it, I'd love to trim off the $400+ that I see them going for online. In any case, I think I do need some help sizing my system and components. Any takers?!
We use Wrightsoft to design everything and recommend sizing to the final building envelope.
I will re-run my calcs with my intended envelope. I admittedly have the fear of under-sizing the equipment, mostly because it seems like some of the old-school plumbers (I know, I know) are so against it and general, uneducated consensus has suggested much larger boilers. I thought I would play it safe and split the difference in my sizing, but I now have every intention in sizing the boiler for the life of it. I'd rather not install the new system and embarrassingly still need the sweater or temp heater, but if I have to do it for a few days during the coldest parts of ONE winter, I can live with it.
you'd be about 10KBTU/hr short of boiler out at 70F indoor temps but only 5K short at 65F, and fully covered for 60F indoors. In the unlikely event that it stayed 10F...a 3/4 ton mini-split in heating mode would also be able to more than make up the shortfall
Breaking the numbers down that way, especially considering the limited time that the conditions are as noted, I feel more comfortable with the smaller boiler. Also, I have thought about mini-splits, but the designer in me, and the complainer in my fiance, doesn't want to be adding any "furniture" to the walls, although I probably will put a small one in the basement, more for cooling than for heating.
Interesting about your home and encouraging to know getting towards 35K is something I can legitimately strive for, especially considering your colder winters in MA than mine in NJ. My home being a raised ranch with a fair amount of roof, I'm kinda banking on the solar heat gain for this winter, even though convection won't work in my favor :mad:
It's pretty cheap to seal penetrations into the attic, then pick up a bunch of blown in insulation.
I have every intention of renting an AttiCat (or whatever the big box rent), especially after $320+ cooling bills this summer with being very conservative with our old, but kicking central air. The blown-in is a guarantee and probably will get done this winter Maybe it'll be nice and toasty in the attic while my new boiler fills the house with heat. :D
I am now much more comfortable with properly sizing the boiler itself, but am a bit hesitant on the sizing of the other components. I have a friend who works at a plumbing supply and has been asking me to get him a list of what I'll need, but so far I know is a whole lot of copper, a 30-40g indirect hot water tank, and (1) boiler.
If anyone wants to take a look at my layout, I'd be more than appreciative. For clarity, here's a link where the image quality isn't reduce if you're so inclined: http://db.tt/RK79aYjn (I apologize if you've seen this before)
Thank you anyone and everyone in advance!