On 14/03/2015 20:00, Nightjar cpb@ wrote:
Deciding whether the water supplies are properly protected against
insects entering stored water, considered to be the main vector, is.

1) That's the first I've heard of insects being involved in legionella
risk. Which ones are relevant to properties in England?

2) How much of a risk is this vector for a combi CH system which doesn't
store much water and isn't open to insect entry AFAIK?