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ecoFIT pure system

The cupboard-size system boiler for any home

  • High performance build, smart controls and efficiency
  • Compact enough to fit in a kitchen cupboard
  • A full range of heating control options, from our simple analogue timers to our vSMART™ smartphone app
  • Quiet Mark approved, meaning it’s the quietest product in its category*
  • Standard 2 year warranty. Free 7 year warranty when registered by a Vaillant Advance installer


*Excludes 15kW and 30kW models

If space is at a premium in your home, the cupboard-size ecoFIT pure system boiler is the choice for you. It’s designed to be flexible, with a rear flue option available to give you more choice where you put it.

But being lightweight and compact, doesn’t mean you have to compromise on comfort. The ecoFIT pure’s powerful aluminum heat exchanger which offers outstanding performance and low energy consumption for any home.

It’s smart, too. When you don’t need as much heat, it will reduce itself to just 20% of its maximum output – meaning greater energy efficiency and lower bills for you.

And because it works with vSMART™, you can control your low-cost, climate-friendly heating via the internet.

Vital Statistics

  • Five system models covering 12, 15, 18, 25 or 30kW heating outputs
  • ErP A rated for both hot water and heating efficiency
  • Dimensions in mm (612 model): H 700 x W 390 x D 295



Technical dataUnit of measureecoFIT pure 612ecoFIT pure 615ecoFIT pure 618ecoFIT pure 625ecoFIT pure 630
Boiler type systemsystemsystemsystemsystem
Signature model output 12kW15kW18kW25kW30kW
Article number 00100203950010020396001002039700100203980010020399
Gas Council number 41-694-0341-694-0441-694-0541-694-0641-694-07
Boiler dimensionsmm700 x 390 x 295700 x 390 x 295700 x 390 x 295700 x 390 x 295700 x 390 x 295
Nominal heat output range at 50/30˚C (Condensing mode)kW4.7 - 12.84.7 - 15.95.2 - 19.16.4 - 26.57.5 - 31.8
Nominal heat output range at 80/60˚C (Non condensing mode)kW4.5 - 12.34.5 - 15.25 - 18.36.1 - 25.47.2 - 30.5
Maximum flow temperature˚C8080808080
Flow temperature range˚C10 - 8010 - 8010 - 8010 - 8010 - 80
Flow temperature factory setting˚C7575757575
Approximate condensate volume at 50/30˚Clitres/hr1.231.531.842.553.06
Modulation (max/min)1 : X1:3.31:41:51:4.91:4.9
Domestic Hot Water
Maximum heat output for water generationkW151825.23035
Lowest water pressure to operate boilerbar0.
Lowest water flow for operationl/min-----
Lowest water pressure for maximum flow ratebar-----
Domestic hot water flow rate (at DT = Δ35K) *l/min-----
Hot water output temperature range˚C-----
Expansion vessel sizelitres88888
Gas inlet connection (pipe size)mm1515151515
Heating flow and return connections (pipe size)mm2222222222
Hot and cold water connections (pipe size)mm-----
Heat exchanger materialStainless/AluminiumAluminiumAluminiumAluminiumAluminiumAluminium
Boiler lift weight (Dry boiler)kg3131313232
NOx class 55555
NOx (En 15502-2-1)mg/kWh3233393940
ErP efficiency%9494949494
ErP decibel rating (sound power)dBa4548495154
Fluing options
Maximum horizontal flue length 60/100m1010101010
Maximum vertical flue length 60/100m1010101010
Maximum horizontal flue length 80/125m2525252525
Maximum vertical flue length 80/125m2525252525
Rear flue optionsYES/NOYesYesYesYesYes

*flow restrictor fitted to achieve a Δ42K rise

Related Products

Related Products

Domestic boiler cylinders

  • Slim line, pre plumbed and standard cylinders in the range
  • 2 year guarantee on parts and labour plus 25 year guarantee for the cylinder shell, giving you total peace of mind.
  • Can be retrofitted onto older systems meaning you can upgrade your cylinder without the hassle of the entire system.
  • Improved insulation meaning heat loss is minimised and lower running costs
  • Adjustable feet meaning the cylinder can be installed on uneven ground.