Air compressor hose is cheap & much stronger than any garden hose. Buy it made up from the tool shed or mitre 10. The splitter is just a few small tees held together with a tiny zip tie. You need a mixing chamber after the heat exchanger so you can regulate the temp with cold water. Put a low pressure valve on it to vent steam. I don’t use foam insulation as it makes the hose float & I have surplus hot water anyway. Are you on the coast?
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