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laing is coming out with a less expensive version of their dc vario (http://www.lainginc.com/D5_Vario.htm) if they can get it down to $100, it makes $$$s over the life of the system to have a pump per zone that only draws 5-10 watts!!! The pumps are permanent magnet electronically commutated motors like the ones in your computers hard disk and run on 12-24v 3-30watts (imagine a pump with an ac adapter! or a complete heating system for which a 12hr battery backup is practical) you can get wilo stratos ECM one today but its a little big for a pump per zone off a radiant manifold with the laing, and a little vertical up and down staggering, you will be able to have the pumps practically on top of each other - I got a whole bunch of jobs right now with each radiator on home run pex just screaming for such a pump I am soooo frustrated with how slow this technology is moving - compared to the scientific advances of the last century, we are asleep