It takes a while for hot water to flow through the taps, is there something wrong with my HWHP? What should I do?

It takes a while for hot water to flow through the taps, is there something wrong with my HWHP? What should I do?

This is often an issue with plumbing rather than your hot water system.  Every hot water system has some lag time for hot water to reach the taps. This will be longer for longer pipes, i.e. the distance from the tank to the tap. Also the lag will be more noticeable in cold weather. Putting insulation (sometimes called “lagging”) on the hot water pipes will help but sometimes the pipes aren't accessible. 

If you have a hws with a storage tank (like a hot water heat pump), there are regulations that require a tempering valve to avoid scalding in the bathroom. This automatically mixes some cold water into the hot, reducing the hot water supply to 50 degrees C. That's fine if you've got short pipes, and/or well-insulated pipes. But if they're long and/or poorly insulated, heat losses result in water from a hot tap or shower head being not hot enough, e.g. less than 40C.

The most comprehensive solution is to have a plumber install a tempering valve close to showers and baths, and omit the tempering valve near the hot water unit. 

However, if you are concerned it is best to contact your supplier.