Measuring the resistor you have would make sense - more procrastinating means it seems a 1W resistor is 9x3.2mm and a 2W is 11.5x4.5mm.
https://www.ebay.co.uk/itm/100ohm-1M-ohm-Various-Value-Resistors-In-1W-2W-Power-5-Pack-of-5/231188935817?
Resistor measures 15.2 x 4.8mm. So maybe 3w?
This handy chart on RS Components makes me think it's 3w
Is there an issue putting a higher power rated resistor in?
@Scrabble started
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Measuring the resistor you have would make sense - more procrastinating means it seems a 1W resistor is 9x3.2mm and a 2W is 11.5x4.5mm.
https://www.ebay.co.uk/itm/100ohm-1M-ohm-Various-Value-Resistors-In-1W-2W-Power-5-Pack-of-5/231188935817?