Can I you advise me about power showers?

you have options ..a pumped electric shower or an electric shower with an in-line pump ..both work well .remember you must get a reg sparks to do the electrics ..he will need to fit new cable from consumer unit with its own mcb ..mains circuit breaker ..im a builder ..best shower i have found is a MIRA SPORT .9.6KW .this shower will give lots of hot water .your plumber can install an in-line pump before the shower ...however i do have one concern ...tank water in a shower ..not good news ..especially as its in a holiday home .nothing worst than standing water to make you ill ..showers ..water in mouth etc ..need more proof? Jacuzzi baths have drainage to every one of its jets ..to prevent stale water ..they should know ..suggest you drain water tank every time you reuse your holiday home