All energy-saving devices will reduce your utility bill, but how many can save you serious money when all the costs are factored in?

The capital outlay for purchasing the equipment is only the beginning. Other variables that need considering are:

- installation

- maintenance, which must include

- labour costs

- spare parts and replacement, which depend on

- lifetime claims, guarantees and warranties

- impact of new equipment on existing infrastructure

And of course, the costs beyond the scope of any installed technology:

- future energy prices

- cost of capital

Here is how the Zenergy performs in terms of these important factors:

Read more here for a worked example using typical European prices.