ecoFIT pure open vent boiler

412, 415, 418, 425, 430 and 435 outputs

Compact, cupboard fit solution
Top and rear flue options
Automotive grade aluminium heat exchanger
Hand-built in our award-winning Derbyshire manufacturing plant
2 years guarantee as standard, with 7 to 10 years available when you book a Vaillant Advance installer

Overview

As one of Europe’s leading heating technology manufacturers, ‘thinking ahead’ is a culture which is embraced throughout Vaillant. Our products feature high energy efficiency ratings and low emissions, and come with an enviable reputation for performance, quality and reliability. This comes from proven German engineering combined with award winning UK manufacturing.

Ultra-quiet operation (Quiet Mark approved), small footprint and total flexibility of siting (with top and rear flue options) mean that the ecoFIT pure range fits in with your customers’ needs.The automatic purging assistance and high specification, aluminium heat exchanger makes for a lightweight installation. High quality and high efficiency, together with the complete availability of spare parts and the easy accessibility of the unit layout mean the ecoFIT pure is easy to maintain too.

At Vaillant we are working towards low carbon solutions today. As part of the HyDeploy project, Vaillant boilers have been tested with up to 20% hydrogen blended with Natural Gas, however we are currently undergoing many tests to each of our boilers to validate their compatibility with up to 20% hydrogen.

Features & benefits

Available in 12, 15, 18, 25, 30 and 35kW outputs
Top and rear flue options on all boiler models - Allows flexible siting options and installs in various property types
Compact, cupboard fit solution - Small boiler footprint, offering flexibility of siting, including a cupboard-fit
Clear LED display - Offers visibility in dimly lit areas for easier installation and use
Easy installation and maintenance - Accessible layout that allows all components to be replaced from the boiler front
Recognisable Vaillant fault codes - Making it easy to diagnose faults
High specification aluminium heat exchanger - Designed to last longer, maintain easily, and reduce energy bills
High quality components - Offering peace of mind for the lifetime of the product
Industry leading flue lengths - 10m flue length across all ecoFIT pure boiler outputs
4-sided cooling and water agitation of the heat exchanger - Reducing stress on the heat exchanger for longer life reliability and reduced maintenance costs
Compatible with Vaillant’s intelligent range of controls - For the most convenient and energy efficient system, saving on energy bills
Standard 2 year warranty, can be upgraded to a free 7 year warranty when registered through Vaillant Advance. For homeowner piece of mind
Option to purchase extended warranty up to 10 years when registered through Vaillant Advance

Useful videos

Specifications

Technical data	Unit of measure	ecoFIT pure 412	ecoFIT pure 415	ecoFIT pure 418	ecoFIT pure 425	ecoFIT pure 430	ecoFIT pure 435
General
Boiler type		open vent	open vent	open vent	open vent	open vent	open vent
Signature model output		12kW	15kW	18kW	25kW	30kW	35kW
Article number		0010020400	0010020401	0010020402	0010020403	0010020404	0010020405
Gas Council number		41-694-08	41-694-09	41-694-10	41-694-11	41-694-12	41-694-19
Boiler dimensions (HxWxD)	mm	602 x 375 x 295	602 x 375 x 295	602 x 375 x 295	602 x 375 x 295	602 x 375 x 295	602 x 375 x 295
Heating
Nominal heat output range at 50/30˚C (Condensing mode)	kW	4.7 - 12.8	4.7 - 15.9	5.2 - 19.1	6.4 - 26.5	7.4 - 31.8	7 - 35.8
Nominal heat output range at 80/60˚C (Non condensing mode)	kW	4.5 - 12.3	4.5 - 15.2	5 - 18.3	6.1 - 25.4	7.1 - 30.5	7.2 - 34.8
Maximum flow temperature	°C	80	80	80	80	80	80
Flow temperature range	°C	10 - 80	10 - 80	10 - 80	10 - 80	10 - 80	10 - 80
Flow temperature factory setting	°C	75	75	75	75	75	75
Approximate condensate volume at 50/30°C	litres/hr	1.23	1.53	1.84	2.55	3.06	3.65
Modulation (max/min)	1 : X	1:3.3	1:4	1:5	1:4.9	1:4.9	1:4.9
Domestic Hot Water
Maximum heat output for water generation	kW	15	18	25.2	30	35	35
Lowest water pressure to operate boiler	bar	0.3	0.3	0.3	0.3	0.3	0.3
Lowest water flow for operation	l/min	-	-	-	-	-	-
Lowest water pressure for maximum flow rate	bar	-	-	-	-	-	-
Domestic hot water flow rate (at DT = Δ35K) *	l/min	-	-	-	-	-	-
Hot water output temperature range	˚C	-	-	-	-	-	-
Mechanical
Expansion vessel size	litres	-	-	-	-	-	-
Gas inlet connection (pipe size)	mm	15	15	15	15	15	15
Heating flow and return connections (pipe size)	mm	22	22	22	22	22	22
Hot and cold water connections (pipe size)	mm	15	15	15	15	15	15
Heat exchanger material	Stainless/Aluminium	Aluminium	Aluminium	Aluminium	Aluminium	Aluminium	Aluminium
Boiler lift weight (Dry boiler)	kg	22	22	22	22	22	22
Performance
NOx class		5	5	5	5	5	5
NOx (En 15502-2-1)	mg/kWh	32	33	39	39	40	32
ErP efficiency	%	94	94	94	94	94	94
ErP decibel rating (sound power)	dBa	45	48	51	52	55	55
Fluing options
Maximum horizontal flue length 60/100	m	10	10	10	10	10	10
Maximum vertical flue length 60/100	m	10	10	10	10	10	10
Maximum horizontal flue length 80/125	m	25	25	25	25	25	25
Maximum vertical length 80/125	m	25	25	25	25	25	25
Rear flue options	YES/NO	Yes	Yes	Yes	Yes	Yes	Yes

*flow restrictor fitted to achieve a Δ42K rise

Downloads

Brochure

Domestic range brochure

Size: 7.98 MB

Installation manual

ecoFIT pure open vent installation and maintenance instructions

Device Type: 412, 415, 418, 424, 430, 435

Size: 5.94 MB

Flue guide

Air/flue systems set-up and install instructions

Size: 1.72 MB

User Guide

ecoFIT pure open vent operating instructions

Device Type: 412, 415, 418, 424, 430, 435

Size: 1.08 MB

Brochure

ecoFIT pure brochure

Size: 6.56 MB

Technical specification