Just had new boiler fitting and just had a question regarding tf1 filter. The filter is fitted on the return pipe, the pipe is coming down from the ceiling then up into the boiler. The gas engineer has fitting the arrow on the tf1 filter pointing up towards the ceiling and i thought the arrow should be pointing down follwing the flow of the water in the return pipe into the boiler? Is he correct the way hes fitted it or am i correct? Also if its fitted incorrectly (arrow wrong way round) does it make any difference? Thanks. Also he said i have to send off for the baxi warranty registration is this correct? He said he will fill in the gas commissioning bit and have to contact baxi? Thanks .