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For an RGI you don't seem to know the basics

You don't need to know the gas rate

What are you on about?! You're getting desperate now! What temperature rise should I expect to see at 7 l/min?

I'm struggling to understand what you're on about. Your grammar is really bad sometimes.

And you call me arrogant :mrgreen: You don't have a clue do you!

Obviously it's physics. Do you know how to work it out though dear boy?

There could well be a problem as it hasn't been serviced for a fair while that's why I am paying to get the boiler serviced. Are you referring to Vaillants lie about their 824 only being an 823?

I understand that but if it's achieving the manufacturers stated temperature rise then it must be pretty damn close to operating correctly.

How do the manufacturers work out the 35 degree rise incorporating the gas rate? If you're preaching at me then you must know that?

Tell me how you work it out then as you are an RGI surely you know this kind of thing?

The boiler is working really well thanks. It's getting a 42 degree rise at 8 l/min. (y) So you don't know how to work out the rise then?

What exactly do I need the gas rate for though? I don't think you know what you're on about yourself here. You don't need to know the gas rate to work out the 35 degree rise or the rise I have calculated for my 8 l/min instead of the Vaillants 9.4 l/min rating.

The boiler manufacturers do not use the gas rate when calculating the 35 degree rise. Please show me the calculation that incorporates the gas rate.

Nominal is 2.5 m3/hr for my boiler. I haven't checked it though. You don't need the gas rate for the temperature rise calculation though. You only need the KW rating of the boiler.

No smart meter just a standard meter. Does a poorly performing heat exchanger change the consumption? For example if the secondary heat exchanger was scaled up.

30K on a diesel Honda?! Wow

How accurate would it be from doing it from the gas meter though?

I've just realised Vaillant are lying about their 824. It's actually an 823 so that brings the expected temp rise down a bit which means my boiler is spot on. The 831 and 837 are accurate to their names though.

It's done from the KW rating of the boiler. It's the same formula the manufacturers use to calculate the flow rate for the 35 degree rise but just arranged differently (y)

Do you know how to work it out? If a muppet like me can work it out then surely you must know how to do it?