LightHouse ECOHEAT 135w Electric Greenhouse Heater 91.5cm This electric greenhouse heater W135 is economical to use and helps to protect plants against sudden temperature change. FREE POSTAGE £33.95 This Lighthouse greenhouse electric heater protects against sudden temperature change. Helps reduce humidity and condensation when growing indoors and so helps protect against fungal attack. 135w heater - is economical to run. IP55 rated, splash and sprinkler resistant. Portable or wall mountable. Also helps reduce humidity and condensation when used indoors. Size - 91.5cm long. 1m cable.