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jives11 jives11 is offline
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Default remove lagging from cold water tank in summer ?

On 29 Mar, 21:04, wrote:
On 29 Mar,
"jives11" wrote:





Hi,


I have 2 large plastic water tanks in my loft (= a small header for
the CH). The tanks are black plastic and interconnected. They are also
well lagged.


I was thinking about solar Hot water and it occurred to me that during
the summer it may be of benefit to remove the insulation from the
tanks. The attic can get unbearably hot and presumably the insulation
is working against any preheating of the water before it hits the
boiler for HW ? I'd guess by pure infra red radiation the plastci tank
would heat fractionally on hot days ?


Of course with the mad UK weather there is always the risk of a cold
spell, but I'd guess for a few months the risk would be low.


anyone do this and get any benefit


Don't! It will stagnate at an elevated temperature, and be liable to spread
legionella, particulary if there is a cold draw off from it. It must be kept
at below 20degC.

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Many thanks. I had not thought of that. So how do solar water heating
systems avoid this ? I'd assumed they preheat stored water before it
enters the boiler.

Last year while on holiday in Crete I noticed lots of houses
*appeared* to have black plastic water tanks on their flat roofs. I'd
assumed this was a cheap way to get some raise of temperature.