Did you know 22mm primaries can carry up to 40kW?

Few homes need that for heating. 

In condensing boiler systems, 8mm can carry up to 5kW, which is bigger than any radiator you're ever likely to fit.

When most homes need just 8kW of heat on a cold day, why are we still fitting 22mm primaries?

Mostly habit. 22mm primaries are a hang over from non-condensing heating systems, where each litre of water was expected to carry less heat.

kW is only half the story

We are at a point where condensing systems are moving to heat pump ready systems.

Each litre of water will carry less heat again, which means moving more water through the pipes. But that doesn't mean every pipe needs to change.

The danger is we're upsizing 22mm pipe to 28mm or 32mm without needing to. Or dismissing 8mm as impossible when it can work depending on the home and layout

Room heat loss. Pipe length. Bends. Fittings. They all play their part in whether the system works.

Pipe size can't be guessed at and you may end up adding cost or turning down jobs if you do. 

You need to understand the whole system to stay ahead.

Know the rules? Get the ebook.

Every heating system follows the same connected rules. Change one thing and the rest of the system responds. 

It's the heating engineer's job to create the right system conditions for the heat demand, but that's hard if no-one's told you the rules.

This ebook strips the hidden system logic back to basics, giving you the missing starting point that underpins everything you learn next.