flow return temps

Joined
1 Jun 2008
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Manchester
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United Kingdom
hi. flow temp should be max temp of 85oC return 75oC, 10 oC differential? lower return temp would mean blocked/sludged exchanger most of the time ?is this correct?
 
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excuse my ignorance , but doesnt pump speed also have an effect of the differential ?
 
most boilers will shut down before they reach 85degC
 

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