If you have AquaHot, the thermostat in the wet bay provides heat but you must have the AquaHot on. Mid range setting is around 45 degrees.
I have used a little WD 40 on the handle shafts. If itís still tight it might be the bolts holding the valve together might be too tight, but be careful when loosening them a smidge, they could leak if loosened too much.
2018 Allegro Bus 37AP
2014 Phaeton 40 QBH (sold)
2022 Jeep JLURD