Our website uses cookies to help provide you with the best experience tailored to your interests. To use the website with full comfort, please accept to receive all cookies on our website. For more information with regard to Cookies please see our Privacy policy.

Accept Decline

ecoFIT sustain 15, 18 and 30kW

Specification Open Vent boiler range

  • Designed for specification in the new build and social housing market
  • Compact cupboard fit with rear flue option
  • High efficiency ErP 'A' rated product with strong SAP ratings
  • Compatible with the full range of Vaillant controls and accessories
  • High quality lightweight aluminium heat exchanger with excellent power to weight ratio


Open vent boiler range

The ecoFIT sustain range of open vent boilers offers an excellent size-to-output ratio, giving great comfort whilst ensuring a small footprint. Use of sustainable materials also means the boiler is 100% recyclable. The range features 15, 18 and 30kW models to suit all types of homeowner and tenant properties.

Key features and benefits

• Familiar Vaillant diagnostics - Offers quick and easy maintenance for your maintenance team

• Patented condensate trap - Easy install with a safety back-up

• Fully modulating low NOx burner and fan - For improved energy efficiency

• 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

• Built-in two-stage frost protection - To ensure optimal performance all year round

• Warm start function - Provides tenants with instant hot water

• Modulation range up to a 1:5 - Ensuring low energy consumption and maximum efficiency

• Clear bright LCD display - Easy to read boiler wherever it is sited

• Up to 10m flue lengths - Allows maximum flexibility for location of the boiler

• Controls compatibility - The wide range of Vaillant room thermostats, wired & wireless controls including the vSMART™ app-based controls with weather compensation to lower running costs for tenants

• ErP 'A' Rated product - Suitable for both refurbishment and new build with lower running cost to reduce heating bills



Technical dataUnit of measureecoFIT sustain 415ecoFIT sustain 418ecoFIT sustain 430
Boiler type open ventopen ventopen vent
Signature model output 15kW18kW30kW
Article number 001002527400100252750010025276
Gas Council number 41-694-3341-694-3441-694-35
Boiler dimensions (HxWxD)mm602 x 375 x 295602 x 375 x 295602 x 375 x 295
Nominal heat output range at 50/30˚C (Condensing mode)kW4.7 - 15.95.2 - 19.17.4 - 31.8
Nominal heat output range at 80/60˚C (Non condensing mode)kW4.5 - 15.25 - 18.37.1 - 30.5
Maximum flow temperature˚C808080
Flow temperature range˚C10 - 8010 - 8010 - 80
Flow temperature factory setting˚C757575
Approximate condensate volume at 50/30˚Clitres/hr1.531.843.06
Modulation (max/min)1 : X1:41:51:4.9
Domestic Hot Water
Maximum heat output for water generationkW1825.235
Lowest water pressure to operate boilerbar0.30.30.3
Lowest water flow for operationl/min---
Loest water pressure for maximum flow ratebar---
Domestic hot water flow rate (at DT = Δ35K) *l/min---
Domestic hot water flow rate (at DT = Δ42K)l/min---
Hot water output temperature range˚C---
Expansion vessel sizelitres---
Gas inlet connection (pipe size)mm151515
Heating flow and return connections (pipe size)mm222222
Hot and cold water connections (pipe size)mm---
Heat exchanger materialStainless/ AluminiumAluminiumAluminiumAluminium
Boiler lift weight (Dry boiler)kg222222
Maximum horizontal flue length 60/100m101010
NOx class 555
NOx (En 15502-2-1)mg/kWh333940
ErP efficiency%949494
ErP decibel rating (sound power)dBa485155
Fluing options
Maximum horizontal flue length 60/100m101010
Maximum vertical flue length 60/100m101010
Maximum horizontal flue length 80/125m252525
Maximum vertical flue length 80/125m252525
Rear flue optionsYES/NOYesYesYes

*flow restrictor fitted to achieve a Δ42K rise