"nemo" wrote in message
...
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?

All bacteria in water rely on some form of cantamination for nutrition.
However some are sporing organisms which can last a long time without.
They spring into life when nutrition appears.
Not legionella BTW.

Some forms of jointing paste and gaskets have encouraged bacteria in the
past.
(Hence the use of PTFE)