Water Filter With Thermotop Heater?

[totallyrocks]

Hi, apart from the flow rate is there a reason i cant put a filter before my cold feed on the tap if i have a thermotop c fitted? I ideally wanted it to filter all water so I could drink hot tap water but this would decrease the lifespane of the canister/filter and limit the flow. I think I would have to boil washing up water manually and just have a single cold feed, unless I know the system is clean I could use the shower fitting to get quick hot water.

Anyone done this or similar?