I have a 24V 40VA transformer for my boiler. It powers two zone valves labelled 0.9A each, and two thermostats labelled 1VA each. All of them together would draw about 45VA.
I'm now adding an outdoor reset controller, which will add a small additional draw.
Should I replace the transformer with a 75VA one?
While it seems obvious that I'm already over capacity, the system has worked perfectly for years. I'd like to know if there are any gotchas or special considerations when installing a larger than typical transformer on a boiler control circuit. Should it be avoided? Or is it a good thing to do?
If it matters, the zone valves are Taco T571-2, the stats are Honeywell T4s, it's a Weil Mclain PFG 6 boiler and the new Reset is a Tekmar 256.