There are a few things you need consider to get the most out of your solar water heating system.
Limit how much you heat your water using electricity from the grid. Instead, make sure your solar supply is being used to provide hot water as much as possible.
For example, you can fit a mixer shower rather than an electric shower. Electric showers use electricity to heat the water, but mixer showers take water from your existing hot and cold water supply. Before you install a mixer shower, check with your plumber that the water pressure is sufficient for your needs.
Solar water heating systems might be useful if you use more of your hot water in the evening. This gives the sun more time to heat up the water during the day.
However, it’s more important to make sure that your back-up heating system is set up to come on at the right time. Before you installed the solar panels, your boiler or immersion heater was probably set to give you a full tank of hot water in the morning. If you leave it like this, your system will always start the day with a hot tank and there’ll be no water for the solar panels to heat during the day.
Your installer should advise you on how to set your hot water controls to get the most out of your new system, whatever time of day you use hot water.