Underfloor heating with aluminum composite pipe or plastic

Good day,
yesterday we spoke with a builder about our new construction, I guess he is from the old school (30 years masonry business).
He would recommend a heating system with a solar system, heating panel (I think he means the heat exchanger), and a 300L buffer tank. The underfloor heating pipes he uses are made of an aluminum composite pipe and not plastic. He says the plastic pipes eventually draw in air. That sounds interesting at first, but he mentioned a flow temperature for the aluminum pipes of 60-65 °C. That is quite high.
How should this statement be assessed?

Don’t the plastic pipes run at about 35 °C? That would lead to higher heating costs with the composite pipe.

Thank you for the assessment and clarification....

Best regards

Hello forum community,

Doesn't anyone have an opinion on this?

Best regards

Good Morning

There is not much to say, as all the terms are jumbled up and no one knows what is really meant.

Olli

Hello,

what is mixed up? What information is still needed?

First of all, you still believe quite a lot and know too little for such an investment. The pipe does not determine the flow temperature, but the heat loss of the house influenced by the floor construction and the laying distance does. I would question the thing with the air skeptically. Aluminum composite is not wrong either and will end up running at the same max! 35°C at the design temperature as Bast braided with silicone sealing.

Thank you very much for the information.