I'd ask a local professional company.
I have some questions about transformer. Adding a booster pump in front of the house gas water heater, if both two pumps were supplied by the isolation power supply(isolation transformer), as for the isolation power supply, it is the kind of 1: 1 transformer, Would it be possible to prevent electric shock? What power it is needed? I have read some basic priciple about transformer, the info from an article Transformer Basics and Transformer Principles (enclose the link https://www.kynix.com/Blog/487.html), a little confusing . In reality, the situation is more complex. So is there any one can give some professional advice?