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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
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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

• Compact, cupboard fit solution – A smaller boiler footprint (702mm x 390mm x 295mm) means the ecoFIT Sustain offers siting flexibility, including cupboard fit

• 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

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

• 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 dataUnitecoFIT sustain 415ecoFIT sustain 418ecoFIT sustain 430
Boiler type Open ventOpen ventOpen vent
LPG convertible NoNoNo
Article number 001002527400100252750010025276
PCDB number 184001840118402
Boiler dimensions (HxWxD)mm602 x 375 x 295602 x 375 x 295602 x 375 x 295
Side clearancemm555
Top clearancemm150150150
Top clearance if using rear fluemm202020
Bottom clearancemm150150150
Front clearance *mm600600600
* Can be reduced to 5mm if fitted behind removable door/panel    
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
Flow temperature range˚C10 - 8010 - 8010 - 80
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---
Domestic hot water flow rate (at DT = Δ35˚C)l/min---
Hot water output temperature range˚C---
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
Filling loop suppliedYes/NoNoNoNo
Boiler lift weight (Dry boiler)kg222222
Spacer frame availableYes/NoYesYesYes
NOx (En 15502-2-1)mg/kWh333940
ErP efficiency%949494
ErP decibel rating (sound power)dBa485155
PCDB seasonal efficiency (SAP2009/2012)%89.889.789.8
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
Permissible flue classifications C13, C33, C43, C53C13, C33, C43, C53C13, C33, C43, C53


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