Dynamic range rating on the Baxi 600/800 Combi and System 2 boiler range

In this edition of #TrainingTuesday, Baxi Training Manager Ian discusses dynamic range rating on the Baxi 600/800 Combi and System 2 boiler range.
For more information on the Baxi 600/800 Combi and System 2 range (launched May 2023), head here:
www.baxi.co.uk...
For more information on Baxi training, click here: www.baxitraini...
Please note: This video is intended for competent heating and hot water engineers only, for example must be Gas Safe registered if working with gas, or have the Unvented Hot Water Qualification (G3) and is subject to our full video disclaimer which can be found here:
www.baxi.co.uk...
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[@johnward5006]

So simple, the competition will soon copy you!

[@jamiebrown1592]

Is this the same as the 40kw platinum?

[@raul835]

Brilliant

[@robhamps]

That's back to front. As the return temp increases the flow temp needs to drop.

[@markjones1337]

No it doesn't, when the flow and return temps INSIDE the boiler are getting closer to equal the flame will shut off.
All condensing boilers work best with a 22 degree difference between F and R.
I bet you tell customers than the heat in the condensate is transferred back into the rads, because that's what all muppet heating engineers incorrectly think.
It's modulation than make condensing boilers more efficient NOT recouping heat from condensation.

[@PK-ke1tl]

So we’ve just re-imagined and renamed “Boiler Modulation” then? Oooh re-invented the wheel…. Not! 🤦🏼‍♂️

[@paulstevens5329]

The idea is to match the heat loss from the building…this can’t do that

[@markjones1337]

No it isn't. Range rating to keep (the kettle from boiling) or gettingbto hot to quick it has to kill the flame.
The room thermostat is what takes care the heat loss of the building, not range rating.
Range rating can be though of as being gentle on the accelerator.
If range rating there to match the builder thermal loss, (u valve) you'd ba able to tell me how to measure the U value. But you can't measure it, all you can do is guess/estimate the value based on largely untestable building fabric.

[@paulstevens5329]

@@markjones1337 range rate is to adjust the appliance to match the maximum heat output required to match the heat loss of the building
What are you talking about?