Installation manual
3Instructions for use ecoTEC
1  Notes on these instructions
To ensure clarity of information in instructions a new 
European standard of advice and symbols is being intro-
duced. To ensure compliance with this new standard the 
following details are included.
The following information is intended to help you 
throughout the boilers entire instruction pack.
We assume no liability for any damage caused by 
non-observance of these instructions.
Other instruction supplied with this appliance
For the end user
Short operating instructions
(ecoTEC plus only)  no. 838404
Warranty card with return envelope  no. 802922
For the installer/service engineer:
Instructions for installation and servicing  no. 839592
Flue installation instructions  no. 835296
The instructions for any accessories and controllers 
used also apply.
The Benchmark gas boiler commissioning checklist (in 
the installation manual) should be completed by the 
installer and/or the commissioning engineer.
If, after reading these instructions, you have any ques-
tions on the operation of the boiler, please contact 
either your installer or Vaillant Technical Department.
1.1  Storage of the documents
Please store this user manual and all related documents 
so that they are available whenever they are required.
If you move please pass on the documents to the buyer.
1.2  Symbols used in this manual
Please observe the safety instructions in this operating 
manual for the operation of the appliance.
 Danger
Immediate risk of serious injury or death.
 Caution
Potentially dangerous situations for the prod-
uct and environment.
 Note
Useful information and instructions.
•  Symbol for a necessary task
1.3 CE marking
The purpose of CE marking is to certify that the boiler 
complies with the requirements of the directives 
covering gasfired appliances (Council directive 90/396/
EEC) and electromagnetic compatibility (Council directi-
ve 89/336/EEC).
These appliances also comply with the requirements of 
the directive on operating efficiency (Council directive 
92/42/EEC).
  Vaillant Ltd. support the Benchmark initiative. 
At the rear of the installation manual, you will 
find a Benchmark gas boiler commissioning 
checklist. It is very important that this is com-
pleted correctly at the time of instal lation, 
commissioning and handover to the user.
1.4 Data badge
The type plate of the Vaillant ecoTEC is attached at the 
factory to the bottom of the appliance.
2 Safety
2.1  Setup and adjustments
Installation and adjustment of the boiler as well as serv-
ice, maintenance and repair of the boiler may only be 
carried out by a competent person in accordance with 
the Gas Safety (Installation and Use) Regulations 1998. 
(In the U.K. “CORGI”. Registered installers undertake the 
work to a safe and satisfactory standard). If the boiler is 
installed in a compartment do not obstruct any purpose 
provided ventilation openings, and do not use the com-
partment for storage purposes.
2.2  What to do in an emergency
Danger
Smell of gas. Risk of poisoning and explosion 
due to a malfunction
If you smell gas or suspect a gas leak:
•  Do not switch lights on or off.
•  Do not use any other electrical switches.
•  Do not use a telephone in the hazardous area.
•  Do not use naked flames, such as matches or cigarette 
lighters.
•  Do not smoke.
•  Turn off the gas supply at the gas meter.
•  Open the windows and doors.
•  Warn other residents.
•  Get out of the house.
•  Consult your gas supplier, service agent or other com-
petent person.
Notes on the documentation 1
Safety 2










