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Boiler of the Month: Vaillant ecoTEC Sustain

Published: 03 Nov 2025 ・ Read time: 5 Mins
For a highly efficient gas condensing boiler built for easy replacement and affordable ownership, the Vaillant ecoTEC Sustain stands out. Engineered for engineers and property managers, it is a top choice for social housing and landlord properties, for several clear reasons.
Promoting high ErP A-rated efficiency, excellent hot water performance, and renewable-ready compatibility, Vaillant boilers are renowned for their reliability and reputation, and are known throughout the trade for their ease of installation and long-term, simplified maintenance, thanks to their front-access components.
Here at City Plumbing, the home of heating, we continue to offer our expert boiler recommendations. This month, we're focusing the spotlight on the impressive, Quiet Mark-certified performance of the Vaillant ecoTEC Sustain.

About the Vaillant ecoTEC Sustain 28kw Combination Boiler

The Vaillant ecoTEC Sustain 28 kW ErP Boiler is a high-efficiency condensing combination boiler, primarily designed with longevity, low maintenance, and ease of servicing in mind, making it an ideal solution for social housing and small to medium-sized residential properties.
This model is designed for straightforward installation, especially as a replacement for the older ecoTEC pro, thanks to its familiar footprint and flue compatibility. It is engineered for reliable, quiet operation with an ErP A-rating for both heating and hot water, reducing tenant running costs.

Key Features and Specifications

Its compact size, A-rated efficiency, robust stainless steel components, high DHW output, and front-access design ensure the ecoTEC Sustain provides reliable heating and hot water with low running costs and easy long-term maintenance.
  • Boiler Type: Combination (Combi) Boiler, operating on Natural Gas and using Condensing technology.
  • Energy Efficiency: Achieves an ErP 'A' Rating for both heating and hot water.
  • Dimensions (Compact): Height: 720 mm / Width: 440 mm / Depth: 338 mm
  • Output: Maximum Domestic Hot Water (DHW) output is 28.1 kW.
  • Performance: Provides a DHW Flow Rate of 11.6 litres/min
  • Key Component (Heat Exchanger): Made of high-quality Stainless Steel, designed for long life and features front access for simplified servicing.
  • Noise (Operation Sound Power): Features a Low noise level (around 48 dBa) and is Quiet Mark Certified.
  • Pump Type: Includes a recognised Grundfos High-Efficiency Modulating Pump.
  • Maintenance Design: Facilitates easy servicing with removable side panels and a new condensate trap with safety back-up that is removable from the base.

Key Benefits

  • Low Running Costs: Achieves high efficiency with an ErP A-rating and uses a modulating Grundfos pump to reduce energy consumption, resulting in lower energy bills for tenants or homeowners.
  • Easy Maintenance & Servicing: The stainless steel heat exchanger is designed with front access for simplified and quicker servicing, which helps to reduce repair time and overall cost of ownership.
  • Simple Replacement: Its familiar footprint and flue alignment are consistent with the older ecoTEC pro model, making installation quicker and easier when used for replacement projects.
  • Future Ready: Features a low NOx burner for reduced emissions and is specifically designed for simple compatibility with the aroTHERM air-to-water heat pump hybrid system, providing an easy path to renewable heating solutions.
  • Quiet Operation: Being Quiet Mark Certified, the boiler ensures minimal noise disruption, making it an excellent choice for installations near or within living areas.

Buy Boilers at City Plumbing

With its many features and benefits alongside the industry-renowned Vaillant name, the ecoTEC Sustain 28 kW ErP is a top-quality choice of boiler, particularly for properties that prioritise longevity, ease of servicing, and quiet operation.
A quality combination boiler that promotes high efficiency and reliable hot water performance, both installers and homeowners can be confident of a powerful and low-maintenance performer when choosing the ecoTEC Sustain.
Help your customers make the switch to a Vaillant boiler today. Take a look at our City Plumbing website for more information.

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