ROOT!T Hobby Heat Mat for Seed Trays - Small 25cm x 35cm FREE POSTAGE - A quality electric heat mat to help your plants germinate. Has a single coil heating element - 11W. Small size suitable for 1 standard tray. 25cm by 35cm. £20.95 Quantity: at £20.95 each Add To Basket 0 in your basket View Basket Checkout A horticultural heat mat from ROOT!T to use to heat trays unheated propagators. Size 25cm x 35cm. 11 Watts. Suitable for one standard seed tray. Warms root area to improve germination and rooting. Warms root area by between 5 degrees and 11 degrees over ambient temperatures. Fully waterproof. Durable and fray proof. Suitable for rugged and damp greenhouse environments.