Amazon Basics Pyramid Stand Up Patio Heater Cover – Black Price: £29.39 (as of 09:17 EST- More info)

Outdoor cover fits most pyramid-style stand-up patio heaters up to 2.28 high with square bases up to 0.53 by 0.53 m (WxL); ideal for everyday use; particularly useful during the off-season
Made of woven polyester fabric with water-resistant backing for protection against rain, snow, sun, and dust
Air vents minimize chance of condensation and prevent cover from billowing in the wind