Are you in the market for a direct replacement to the old, sluggish system boiler in your Edinburgh home?

Many of my customers come to me looking for a solution that means they get to keep their existing set-up, without any of the upheaval that comes with switching to a combi – and one of the best recommendations I can give them is the Vaillant EcoTEC Plus 600 range.

So, sit back, relax and find out whether the Vaillant EcoTEC Plus 615 may (or may not) be your next system boiler:


Just like its brother the 612, the EcoTEC Plus 615 is a system boiler that comes in at about the same price as some regular boilers – however, it also has the added bonus of having a pump and pressure system built-in.

The 615 has a very good output for its size, is affordably priced and can easily be added to your existing cylinder and controls. It’s also ideal if you who want to make a fairly clean switch from a regular boiler to a system boiler for a quieter, more efficient system.

Another huge bonus is that this is a high efficiency condensing system boiler, so you’re bound to notice a big difference in your fuel bills and carbon footprint.

Output and flow rate

An output of 15kw to the heating and hot water means The Vaillant EcoTEC Plus 615 is perfect for a small-medium 3 bedroom home with 7-8 radiators.

However, it’s wise to bear in mind that this is not the best choice for a larger stone-built property, especially if you have high ceilings and minimal insulation – so instead, opt for a larger boiler such as a 18kw or 24kw system.

Not sure which size boiler is best for your home? In that case, have your chosen engineer measure your home and determine the heat loss and output required, for ultimate peace of mind.

Also, if you’re changing from regular boiler to a system boiler, ask your engineer to check all your existing pipework and ensure the valves will not be affected by the increased pressure.

And finally, because this is a system boiler, flow rates don’t apply in the same way that they do for a combi – but if you do want increased pressure, you can get an unvented cylinder installed with your system boiler.

Size and special features

The EcoTEC Plus 615 is one of the smaller, compact boilers on the market, so it will happily fit in your kitchen cupboard or Edinburgh press – allowing you to make the most of the available space in your home. And because it’s Vaillant, these boilers are some of the quietest on the market.

Another great feature of this particular type of boiler is that it there is an LPG model available for customers whose homes are not connected to mains gas.


Good news! You’ll be happy to learn that the Vaillant EcoTEC Plus 615 comes with Vaillant’s brilliant 10-year guarantee* (when fitted by an accredited installer).

And, much like Worcester Bosch, Vaillant also has its own dedicated engineers to attend call-outs if you ever need them – so you be sure you’re in good hands.

I often recommend Vaillant guarantees to my customers, as there are no hidden small print or unexpected credit card charges to catch you out, unlike other similar boiler companies.

Tech specs

Below, I’ve put together a quick look at all the important info you need to know about the Vaillant EcoTEC Plus 615:

  • Heating and hot water output: 15kw
  • Ideal for: A small 3-bedroom home with 7-8 radiators
  • ERP rating: A
  • Guarantee: 10 years *


If you have an old system boiler in your Edinburgh home that you’d like to replace with minimal fuss or upheaval, the Vaillant EcoTEC Plus 615 could be a great choice. It’s ideal for small-to-medium 3-bedroom homes that have about 7-8 radiators – any bigger and you might want to size up to the 18kw or 24kw model.

It’s a compact boiler that provides an output of 15kw to the heating and hot water – and it’ll easily fit in your kitchen cupboard or Edinburgh press! Score.

Finally, Vaillant’s amazing no-quibble 10-year guarantee* and dedicated engineers mean you’ll be covered just in case you run into any problems later down the line.

What are your thoughts on the Vaillant EcoTEC Plus 615?

10 year guarantee when fitted by Vaillant accredited installer