where is the loop on old baxi solo so i can drain the systerm 2 add rad

me, May 2009

There is No Filling Loop on The Baxi Solo Boiler, you will find it somewhere on the system, usually near to the boiler, try looking in the cupboard under the sink, or possibly in the airing cupboard, it all depends on the whim of the insteller that fitted it !
Happy Hunting

Boiler Repairman, May 2009