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Putting system together - pump selection help
Last time I built a complete hydronic system was 5 years ago so I would appreciate if you helped me refresh my knowledge a little bit and give an update of what is being used in 2013.
About 1,500sqf per floor: basement and 2 stories, well insulated (total heat loss about 52k BTU or 67k BTU using energy ). Big unknowns are how much additional heatloss happens through the drive under garage (part of the basement, 2 loops) and through stone foundation (some of it are interior basement walls).
To be safe, and compensate for coming global cooIing (ha!), I figured that Lochinvar Knight WHN155 is my thing (30BTU/sqf end up being 135k BTUs - around what this model is rated for) It will be field converted to LP. It's my first dip in the firetube design since I used mostly NTI before.
I plan on 1 zone per level. There are 6 loops already embedded in the basement slab and 1st and 2nd story will likely have 7-9 loops each. It's going to be joist trak install, with 1/2" durock and 1/2" travertine on top of 3/4" OSB subfloor. Obviously insulated, thinking about R-19.
There is more reading I have to on Lochinvar itself but I would plan of primary / secondary piping and zones operated by circulators, wired through Taco relay panel.
The main question I have would be the circulator selection. Lochinvar mentions "boiler pump" (with provided Grundfos UPS26-99FC) and "system pump". Always been a Taco guy but it looks like their ECM pump selection is non-existent for residential.
1. Should I use provided Grundfos pump for boiler/primary pump or pick something else? Variable speed viable here? What makes and models?
2. By "system pump" I reckon Lochinvar meant pump that would work with zone valves - and I would be using zone pumps. It looks like Taco 007 would be my choice here, what other options do I have? Makes sense to go variable speed? ECM?
I am pretty sure i don't need anything else like outdoor resets, etc. since all the work will be done by the boiler itself and then controls - 3 Ecobee thermostats.
Any help and advice is greatly appreciated.
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