1. Anon (1996) Maxorb, selective absorbent film,Trade literature. Inco Alloys Ltd. Hereford, UK.
2. Anon (1996) 3-M brand ECP-305 specular silver reflective film,Trade literature. 3M Centre, St. Paul, Minnesota, USA.
3. Breadbox Water Heater Plans;Baer,1975
4. The Integral Passive Solar Water Heater Book;Bainbridge,1981
5. Superinsulated batch heaters for freezing climates;Bishop,1983