Not being renowned for its efficiency , but I think I'd notice the heater being permanently on on a hot day. You could always stick a tap in the middle of it ala series one? If for some reason you don't want to or cant fit another series 3 tap.
My 74 has the pipe from the tap heading off to the lower of the two heater matrix inlets with the higher going to the back of the engine. Is the existing tap munted?
cheers,
D



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