On Sat, 01 Feb 2020 05:13:35 -0600, Bev wrote:

The length of hot water to taps/shower pipe runs from a combi
boiler will be great and need a lot of running off before the hot
water comes through but it avoids the need for a cylinder.

Not just at first start either - if you are using hot water in short
bursts you get a slug of cold water followed by excessively hot each
time you turn off and on again; ok if you're running a bath,
wasteful otherwise. Avoid combi if you can.