Anyone have any experience with fan convectors such as these http://www.mysoninc.com/store.asp?pid=16794?

    Dana1 has convinced me that my backup backup heat should be a heat pump plumbed to an accumulator tank: Passive solar first (knock on wood); wood boiler stove second; heat pump  third. I'd want to coast overnight regardless, using the heat pump only at optimum COPs. I'm willing to to let the temperature in the house drop as much 10 degrees overnight, but I'd love to make an exception for the master bedroom and a bath.

      Fan convectors operated by thermostat could heat them and operate overnight on a  smallish tank.  (My main storage is 25 tons of radiant slab so I don't want to go wild on water storage.) We're talking about heating 400 SF to 600 SF in a 1600 sf house with a total design loss of 25000 btu/hr at 10 degrees.

    How noisy are they? Wall or floor? Would a ceiling fan on reverse be enough to move the heat around? How well would they work at low tank temperatures? Is oversizing a problem? (I'd add the heat pump in Year 2 once I know how the house performs, but I'd want convectors in right away.)

     Thanks for your help. I am getting close. 

BTW, click on "Wood Burning Systems" link on this website http://www.heatweb.com/ to see how the Brits spec multifuel reverse indirect tanks. My stove has two circuits so it's easier to do the obligatory thermosiphon heat dump. But the folks here have an ingenious approach in which overtemp in the tank opens a DHW dump to waste, effectively using city water to keep the tank from boiling.