From the specs that I saw on the Titan 250, the flow rate should be between 50 - 200 gph
If you utilize a sump on your setup, then you can devise a tee fitting incorporating a ball valve. Problem with this is, you end up spending money for fittings, tubing, return piping, ball valve & you would need a pressure gauge to ascertain the flow rate.
I would take the easy way out & just hook up a Fluval 204 cannister filter to the chiller. This way you won't need to figure out the flow rate. The Fluval 204 is rated @ 180 gph
and over time if you use this also as a media trap such as carbon, the flow rate will slightly decrease but never towards the 50 gph
minimum that the Titan needs.
This would be the simplest setup, you can hook this up on your 60g tank like any generic cannister setup 'cept that the Titan will be in-line or if you have a sump, you can hook up the intake & outake on each end of the sump. (don't hook up one end to the tank and the sump, you'll create a siphon during a power outage & will flood your sump, cabinet & floor)
I currently use a Fluval 104 to push water @ a slow flow rate through a UV
sterilizer utilizing the sump method. This also permits me to take advantage of stuffing carbon in the canister due to the effectiveness of water forced through carbon vs "flowing around" the carbon. In the past I hooked up all kinds of do hickeys to tee of my return pump with flow rate measurers & I still ended up going the cannister way after constant adjustments to the ball valve. I found that canisters hooked up above water level such as sump setups tend to trap air over time, but with the newer design of the fluval series, it has not lost it's siphon over a period of 12 months. Hope this helps.