Having a new kitchen put in , including a new hot tap, nothing wrong with one coming out. The fitters have kindly offered to put in a neighbours kitchen, so will cost her nothing. The question is would it save her money. Clearly would use instead of a kettle and to get hot water for dishes etc. So use less gas ( hot water) not sure what it is like v kettle.( for electric) I find it so much more convenient, but it costs me nothing to run