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I might be wrong, but the xtreme 36 only seems to give around 1.5L per minute more hot water than the rapid, at £800 more than the rapid 32 it would have to use a lot less energy to make it worth the cash.
I'm running 9 rads and will be powering and underfloor heated room (40m2), with 10 rads you'd have no problems running from rapid or eco RF.
FWIW, I was quoted to £3800 for a complete install, from nothing to finish (if this helps)
Yeah just checked that and its about 1.5l for the Xtreme. It also modulates lower but I don't really know how much of a benefit that is.