RE: 24/7 versus limited on and off time for water heating

["Pete Church" <yahoo@xxxxxxxxxxxxxxxx>]

I think the 2 hours was implied in an earlier post - a c.200 Litre
tank
needed about 6kWh of energy, which if heated with a 3kW immersion would
take
2 hours.  Now the variables in reality will be different - you may not be
heating from scratch and you may have a higher power heat source.  2 hours
would be a maximum in this scenario.



However the tank stat should turn off the demand for heat from the heat
source when the desired temperature is reached so even if the heat source
is
live for 2 hours it will only run for as long as it is needed, so
additional
control shouldn't be needed  (sorry! ;-( )



Pete

_____

From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
Vargster
Sent: 13 September 2010 19:35
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] 24/7 versus limited on and off time for water heating





Chaps,

Where does this magic "two hours" heating time come from?
I'd set it to an hour and see if you run out of hot water, then
increase/decrease as necessary.

I had mine set in steps for monthly periods, starting at 15 mins, going up
to an hour during January, never as high as two hours!

The solar h/w panel install over summer has spannered that s/w, so need to
write some more code to read the tank top temperature and apply so logic to
generate a minimum heating time (subject to SWMBO not being aware heating
times are being adjusted).

Lee

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