The booster is simply a backstop to make sure you always have hot water available, such as during cloudy or rainy weather or during the winter months. It also operates should you exhaust the stored water on those occasions when an extra family stays for a weekend!
If the majority of your hot water is used in the evening (i.e. for running baths & spas etc) then re-heating will occur as follows depending on the type of booster:
Electric Boost
the thermostat will turn on the element overnight to bring the water back to temperature. This means that if no hot water is used in the morning the suns energy is wasted the next day as the water is already hot.
Gas Boost
the booster will not activate until the hot water is required. If that is early morning then the gas booster will be required, but if later in the day, some solar reheating will have occurred.
Regardless of whether your hot water is used in the mornings or evenings, gas boosting is the most efficient, convenient and cost effective boost option.
Gas Poster Operate only on demand and have the additional benefit of never running out of hot water
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