Active job

Infinity/califont replace gas low pressure cylinder

Hello! I'm needing to replace the current hot water cylinder (low pressure, natural gas) with an infinity/califont system (mains pressure, natural gas). Current water piping is all JG Speedfit PEX, gas piping is galv, no other gas appliances connected to the gas line. The location of the current hot water cylinder and water pipes are within 1m of where the infinity would go on the side of the house. Good access to underneath house (see photos). External RCD'ed power point already exi --- 1 or 2 metres of where an infinity could sit (see photo). Kitchen is being renovated, so there is no gib on walls, no kitchen benches in the way etc...nothing to worry about getting dirty. I have spare Speedfit brass to PEX 22mm connectors ready to connect Speedfit to copper pipe. Seems like it would be very straightforward installation? Thanks for looking :)