Lighthouse ECOHEAT 80w Electric Greenhouse Heater 608mm This electric greenhouse heater is economical to use. FREE POSTAGE £23.95 Quantity: at £23.95 each Add To Basket 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 - 608mm long. 1m cable.