As I'm driving home today i could smell coolant. When I got home I took a look under the car I could see water pissing out. Every time I top up the water it pisses out again. So I jacked it up (spare wheel jack) and got under. I previously replaced the heater tap and from what I can see (at this time of the night) is the what it pissing out from above the heater tap & under the intake manifold from mid to rear. Could this be the heater hose?

Wait for it to Cool down and check it out from above. If its pissing out should be able to find it

Firstly you're a game man getting under a car that is being held up by a jack... I never trust my life to a hydraulic hose or a screw thread...

Secondly there is a steel heater pipe that runs around behind the motor back to the fuel pump... This is the return to the pump for the heater circuit/ bypass circuit... Where the bypass hose fits onto this steel pipe it has a manufactured 3/8" barb off to the side of it for this hose... They're brittle, esp with age and corrosion... I bet it is either snapped off or half snapped off... Good job changing that pipe too if that's the case...

That or you've split a hose if you're sure it's not the tap...

Cheers,
Tim