The only thing you can do is add a pump and make sure your pressure into your RO unit is 65 psi constantly. (if it is already then forget the pump)
It would cost you a lot more money to warm your feed water with a heater than it would to simply waste more water. (electricity is much more expensive than water)
One other possible option is to coil your RO feed tubing in your sump. This will cool your tank water as well as heat your RO feed water. You must be careful not to cool your tank water too much though otherwise your heater will run and you are back to square one.
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