Question: We are planning to set up a disaster site. This disaster site will be composed of large amount of computer hardware (desktops, computers, servers, storage disk, modems, printers, scanners and etc.) I would like to know what is meant by "Stand By BTU" Please advise. Answer: It's not really a scientific term, but in your case it might mean how much heat the units (computers, etc) put off when they are just sitting there. For instance, people put out about 300 BTU per hour just standing around...more if they are active. Computers and other electronics often put out a decent amount of heat. If an appliance is 200 watts, and this is being all put into the air as heat from heat sinks, fans, etc - that is about 700 BTU. This has to be figured in for air conditioning, etc.