Actually, let's see if I can still do an Ontario load calc.
@Kevin Essiambre can check my work
100 sq ft = 102 m^2
90m^2 = 5000W
next 90 m^2 =1000W
heat =10000W
range =6000W
dryer (at 25%) =1200W
water heater (at 25%) = 750W
That comes to = 23950W
making current (/240) = 99.79A lol That strike anyone else as funny
So barring errors or larger appliances, a 100A service meets code in Ontario.
Unlikely to trip main.
Yup, that is accurate.
Now, what if the service is done with #2 aluminium? Table 39 states #2 is only good for a calculated load of 95 amps. I hope its #3 copper or larger aluminum.
Of course, it is existing...
I knew the load calc would come in pretty on the line. I hope they don't add anything! Any supplemental heat would push us over the limit.
OP stated in another post that the tenant may use all of the range and possibly the dryer over Easter weekend. So there is the possibility of the range using it's full rated capacity... but if that causes the main to trip, I would be more concerned about the insulation or the location of the thermostat! Cooking/baking a ton of stuff produces heat. The furnace shouldn't have to run while doing all the cooking/baking... at least, in a perfect world.
To OP, it's fine the way it is for now (at least by CodeMatter's and I opinion, and according to our code). If the main does start tripping, you can look into getting 3 quotes to upgrade the service.
I redact what I said in my earlier post saying to upgrade. I'd wait now.
Sent from my new phone. Autocorrect may have changed stuff.