With the nights drawing in it’s worth noting that UV units with little or no flow going through them over night should have some attention given to them before it’s gets down to sub-zero temperatures. There are a couple of ways that we recommend doing this.
If the unit is in use and your lamp is left on, then insulating your pipework is a great idea. The lamp will keep the water in the chamber warm enough to stop freezing, but your pipework will still be vulnerable.
If you turn your unit off for periods of non-use them you need to pay extra attention. Every spring, without fail, we have people call us up where the ice in the reactor has shattered quartz sleeve and water is gushing out of the unit. Don’t be that guy! If your unit is going to be turned off over winter then drain your unit down. The equipment inside will be absolutely fine.