Zalman ZM-RF1 Reserator Fan Kit
 

I located mine next to a return vent in my house, and in summer or winter months when the system is heating or cooling, the Reserator receives a good amount of circulating air. In the spring and fall however, the handler runs only infrequently, and during those months average water temperatures typically climb a few degrees. More than once I wondered if there wasn't some practical way to attach a fan to the Reserator fins. Well the folks at Zalman must have read my mind.