LightHouse ECOHEAT 80w Electric Greenhouse Heater 60.8cm This electric greenhouse heater is economical to use. FREE POSTAGE £23.95 This Lighthouse greenhouse electric heater protects against sudden temperature change. 80w 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 - 60.8cm long. 1m cable.