
Honest, technical buying advice from AHHAC's licensed hydronic engineers — cost, COP, ROI and brand comparisons to help you specify the right system for your Australian home.

What a system costs in 2026, how to read COP, running costs by climate, and Maxa vs Viessmann vs Immergas.

Realistic ROI and payback, how to size the array and thermal store, and pairing solar with a heat pump or gas backup.

An independent, installer-grade comparison of the three brands AHHAC carries — COP, refrigerant, output and warranty.