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ecoTEC sustain 24, 28, 34kW

Combination boiler range

  • Designed for specification in the social housing market
  • Quiet Mark awarded
  • High efficiency ErP 'A' rated product
  • High quality stainless steel heat exchanger designed for long life and easy maintenance
  • New condensate trap with safety back-up


Combination boiler range

The ecoTEC sustain is a new generation of boiler, designed for specification in the social housing market with easy use, longevity and low maintenance firmly in mind.

The ecoTEC sustain range of combination boilers feature a high-quality stainless steel heat exchanger, designed with front access for ease of service, resulting in less time and money spent on repairs and ensuring your tenants' peace of mind.

The range features 24, 28 and 34kW combination models to suit all types of tenant properties. Where a specification requires a system or open vent boiler, ecoFIT pure products can be used.

Features and benefits

  • Compact dimensions: 720mm (H) x 440mm (W) x 338mm (D) - For flexible siting options (ecoTEC sustain is the same size as ecoTEC pro)
  • High-quality heat exchanger - Stainless steel heat exchanger designed for long life and easy maintenance
  • Removable side panels and push-fit flue system - For improved accessibility and ease of installation
  • Modulating low NOx burner and fan - Lower emissions to fulfill social housing green credentials
  • Recognised Grundfos high-efficiency pump - Modulating high-torque pump uses low energy to deliver a balanced output to meet the boiler demand, helping to reduce energy consumption
  • New condensate trap with safety back-up - Removable from the base of the appliance for easy install and maintenance
  • Large illuminated blue on black LED display - Easy-to-read boiler display wherever it is sited with simple fault code identifications
  • Compatible with aroTHERM air-to-water heat pump hybrid system - Making the perfect entry into renewable systems
  • Familiar footprint and flue position - Makes replacing an existing ecoTEC pro with an ecoTEC sustain quicker and easier; compatible with all existing Vaillant flue components
  • Controls compatibility - The wide range of Vaillant room thermostats, wired and wireless controls including the vSMART™ app-based control with weather compensation to lower running costs for tenants
  • ErP 'A' rated product - Suitable for both refurbishment and new build with lower running costs to reduce tenant heating bills



Technical dataUnit of measureecoTEC sustain 24ecoTEC sustain 28ecoTEC sustain 34
Boiler type combicombicombi
Signature model output 24kW28kW34kW
Article number 001001998000100199810010019982
Gas Council number 47-044-7947-044-8047-044-81
Boiler dimensions (HxWxD)mm720 x 440 x 338720 x 440 x 338720 x 440 x 338
Nominal heat output range at 50/30°C (Condensing mode)kW7.0 - 20.18.0 - 20.19.1 - 19.9
Nominal heat output range at 80/60°C (Non condensing mode)kW6.4 - 18.57.4 - 18.58.4 - 18.5
Maximum flow temperature°C808080
Flow temperature range°C30 - 8030 - 8030 - 80
Flow temperature factory setting°C757575
Approximate condensate volume at 50/30°Clitres/hr1.871.871.87
Modulation (max/min)1 : X1:3.81:3.81:4
Domestic Hot Water
Maximum heat output for water generationkW24.328.134.0
Lowest water pressure to operate boilerbar0.30.30.3
Lowest water flow for operationl/min1.71.71.7
Lowest water pressure for maximum flow ratebar0.80.80.8
Domestic hot water flow rate (at DT = Δ35K)l/min9.911.614.1
Hot water output temperature range˚C35 - 6035 - 6035 - 60
Expansion vessel sizelitres888
Gas inlet connection (pipe size)mm151515
Heating flow and return connections (pipe size)mm222222
Hot and cold water connections (pipe size)mm151515
Heat exchanger materialStainless/AluminiumStainless SteelStainless SteelStainless Steel
Boiler lift weight (dry boiler)kg30.830.832.8
NOx class 555
NOx (En 15502-2-1)mg/kWh32.834.231.1
ErP efficiency%929292
ErP decibel rating (sound power)dBa494843
Fluing options
Maximum horizontal flue length 60/100m9910
Maximum vertical flue length 60/100m101011
Maximum horizontal flue length 80/125m232831
Maximum vertical flue length 80/125m232831

Related Products

Related Products

vSMART™ intelligent room control with app

  • Smart phone app for both Android and Apple iOS application
  • Self learning
  • Weather compensation

Vaillant VRT 350 heating control

  • Easy to use with flexible functions
  • Choose between wired and wireless controls
  • Reduce your energy bills by using the minimum energy required

Vaillant VRT 50 Room Thermostat

  • Simple to use
  • Digtial display of current room temprature
  • Compatible with the timeSWITCH 150