The high preceision PC series of resistors from Alpha with heat sink can be used up to a rated power of 10W.
Note
Note 1: Resistance figures for type PB are guaranteed at a point 12.7 ±3.2 mm away from the resistor However, where the resistance value is less than 10 Ω, it is guaranteed at a point 5.08 ±0.6 mm away Note 2: Heat sink: aluminium chassis 152.4 mm (L) ´ 101.6 mm (W) ´ 50.8 mm (H) ´ 1.0 mm (T)