Solar hot water heating options

Energy
3

Adding to @PhilT’s advice (I altered the heading to better reflect your request):

There are a number of topics that cover the subject you have asked about. Some of the topics will be a few years old but the principles will remain fairly constant.

Some are about replacing gas systems, some are specific about the brands. In large part though most will have something that will add some value to answering your question.

Searching on “hot water” and/or “solar hot water” should give you some good hits.

Some results to get you started

Also worth a read is

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