Running an fan through the middle to blow air up the pipes would help it radiate out. Bend the pipes around a 55 gallon barrel and make a rocket style insulation around it with sand and plaster. Place some sort of central blower to control speed of air
Outdoor bench made from upcycled oil drum (from student competition at London Architecture Festival I'd love to try this! How about making the slats removable, then it could double as a barbeque grill?
Grow sweet strawberry in a vertical PVC tube is great solution for small garden or yard. Vertical planter will save you a lot of space, at the same time keep plants out of reach from garden insect pests AND enable you to switch to hydroponics.
This is the smaller of our sauna barrels and is available in two sizes of and As well as the untreated sauna barrel we have the same sizes available in Thermowood which is a process used to enhance the properties of coniferous wood.