I can only assume its blind ignorance to the fact that you can have a cracking shower from a stored hot water system, either with a mains presure tank, or a pump on the deliver. ... There also appears to be an understanding the stored hot water is 'old hat' and electric is the way to go, which was certainly advertised to be the case in the 80's but if certainly no longer the case, look at a new builer, there all on stored mains hot water, cracking showers, not crappy combi's to go wrong, job done!