On 04/11/2015 21:35, rick wrote:
On 04/11/2015 19:48, dennis@home wrote:
On 04/11/2015 18:04, rick wrote:
On 03/11/2015 22:47, wrote:

I haven't run the numbers but expect you'd be better off all round to
feed

the electric heat into the existing tank. The water wil go above set
point,

and not need other heat sources until the temp is back down again.


NT

Can't do that ... max temp I can have store get to is 60 degree .......
any higher and you risk damage to underfloor heating pipes.

They should have a mixing valve to prevent the floors getting too hot.


No the design has a mixing valve on the DHW take off, but the main feeds
off for the UFH loop is not via a mixing valve ... the main tank stat
prevents it going over 60 degree.

They normally use tall cylinders for these applications so that you can
rely on stratification to deliver lower temperatures to the UFH using
lower tappings on the cylinder. That does not stop you having the upper
section hotter than the UFH temperature.


--
Cheers,

John.

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