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High-head Low-flow pumps I can variable speed
I've been searching for pumps I can use for medium to large drain back solar systems on tall buildings. Typical systems are 15 to 20 GPM, 40 to 50 feet of lifting head at filling time. I have some Taco 2400-40 and 2400-50s that work well with fixed speed controls. However, I want to use the variable speed outputs on RESOL controls (relayed up to proper amperage of course). What brands/models are installers out there using? Unfortunately the system I am building now is too tall for the Grundfos UPS series, otherwise I'd go there... No, I do not want to double-pump because we use water (bad failure mode!).
Jamie in Boston MA.