Stirling engine micro-CHP This technology is new to the market, although the principal of the Stirling engine is well established. The electrical output is small relative to the heat output (about 6:1) but this is not necessarily a problem for micro-CHP.
1 Kidney pain and back pain can be difficult to distinguish, but kidney pain is usually deeper and higher in the back located under the ribs while the muscle pain with common back injury tends to be lower in the back.  Causes of kidney pain are mainly urinary tract infections and kidney stones.
Health and Wellness. Musculoskeletal problems are the most common cause of back pain, but occasionally, back pain can be a symptom of kidney problems. If you are experiencing pain that moves towards your side and groin area, or if you have a fever or urinary symptoms, then your kidneys could be the source.