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Weil McLain Aqua Plus differential control - tepid to scalding
I have a fairly new 80gal Aqua Plus attached to an Evergreen 105 boiler. A recirculation loop is also installed.https://www.weil-mclain.com/sites/default/files/field-file/WM Aqua Plus Series 2 Water Temperature Controller Instructions 082718.pdf
The differential on this seems to be about 15F. When I set it to 120, I've gotten nearest sink readings from 108 to 120. Raised setpoint to 130 and have seen 112 to 125. Raised again to 135 and see 117 to 132. These are all taken when the tank is not calling.
The instructions don't say that you need to always install a tempering valve. But with this big of a differential, I don't really see how our family can safely use it without one.
80 gallons of water at 108 is not what I'm looking for. Calling for heat when sink drops to 117 seems more appropriate. However, the 132 seems risky to me. We only have adults and teens in our family, but I worry about elderly visitors.
Is this normal for these tanks? Or do people usually see better differential control?