Donya, we just went through EXACTLY the same thing. We bought 2 extra 2x20 last year so we had 4 total. The 2 old ones alrady had repairs to them so this spring I order a set of 4x20 SolarBear with hoses and all the accy for $239 (Pcpools.com) Well, those came and we hooked up with the 2 from last year, BUT 0 DH did not blow them out well and we had fountains galore in those.

To replace those two, I just bought 4x20 SolarBears at PoolProducts.com for $213 without all the hoses, etc and no shipping, just the handling fee $8.95 - I like the 4x20s better. We are currently running just the one set of 4x20 until the second set arrives (due on Tue/Wedn) and we are up appx 5 deg with just that but we have only had 3 sunny days since they were hooked up. It will be better when the second set arrives.