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In one of the houses we lived in had similar, tortuous pipe route from (electrically heated) hot water tank to kitchen via bathroom - wastes over 4l of water to get hot out of the kitchen tap. Being on a water meter it made hot water from the tap our dearest utility. It's not just the cost of water and disposal but the cost of getting the water hot and the wasted heat from that water in the pipe left in the pipes once you have finished drawing off the hot water. Say for half a bowl (4-5l) that's probably of 1&1/2 buckets of water through the hot water tank and pipes.My mate has a combi in his loft. He doesn’t even bother to wait for the kitchen tap to get hot, it takes that long for the hot to get to the tap that they either wash up with cold or boil a kettle.
Mate used to laugh at me boiling a kettle on the kitchen until he had a; a water meter, b; a combi boiler in the loft. His missus did some measurements and calculations and then agreed with me.