Quookers and similar water heaters can usually work off a standard 13amp supply so rewiring only needed if no adjacent power.
Getting instantaneous hot water relies upon a storage cylinders below the sink. Whilst I assume they are well insulated, they will lose some heat. They do not eliminate power consumption - a litre of water boiled in the kettle (roughly) uses the same as another water heater.
The cost of an instantaneous boiling water tap varies between £200 to over £1000. Fitting may cost £100-200 for plumbing and electrical connections.
It is a personal judgement whether the cost is good value against the time saved in boiling a kettle. I usually want a coffee break to relax for 15mins from whatever task I am engaged on. Reducing that to 13 mins with technological help kind of defeats the object!
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