Boiler thermostat truths?

[Servotech]

servotech, are you by any chance the servotech who do servo drive repairs etc?

No. they're nothing to do with me ( I'd never heard of them until your posting)!

I thought that I'd made that name up myself!

servotech is a two part moniker with the servo part meaning that I hope to be of assistance to others who post on here.

The tech bit meaning that I'm an JIB technical grade plumber (which the highest grading that a plumber can be) so you can be sure that you are getting first rate knowledge from my postings.

 

[rojaca]

and you thought Agile was prone to shameless self promotion.

 

[Agile]

If you have a flow of 65c the return will be below the dew point and will condense in the heat exchanger, (at a differential of 10c ) I wouldent run a non condensing boiler at less than 75c on the flow.

I agree 65° a little close and 70° would be safer.

In reality the heat transfer on c.i. heat exchangers which is the type I was mentioning is relatively poor and the flame side fins are at about 10-30° higher temperature than the water inside.

A low water content copper type should certainly not be run with too cool a return.

Tony