Vaillant EcoTEC Plus 635 Boiler Instruction Manual
Vaillant EcoTEC Plus 635 Boiler
Vaillant EcoTEC Plus 635 Boiler
Vaillant EcoTEC Plus 635 Instructions
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Vaillant EcoTEC Plus 635 Boiler Specifications
| Category | Specification | Value |
|---|---|---|
| General | Designated Country | GB, IE |
| Permitted Gas Boiler Category | I2H | |
| CE PIN | 0063CU3910 | |
| UKCA PIN | 0063CU3910 | |
| Gas Connection (Boiler Side) | 15 mm | |
| Flow/Return Heating Connections (Boiler Side) | G 3/4 ″ | |
| Expansion Relief Valve Connection | 15 mm | |
| Condensate Discharge Hose Connection | 19 mm | |
| Air/Flue Pipe Connection | 60/100 mm | |
| Capacity of Heating Expansion Vessel | 10 l | |
| Pre-charge Pressure of Heating Expansion Vessel | 70 kPa (700 mbar) | |
| Min. Flue Gas Temperature | 35 ℃ | |
| Max. Flue Gas Temperature | 85 ℃ | |
| Approved Gas Boiler Types | C13, C33, C43, C53 | |
| NOx Class | 6 | |
| Weight with Packaging (incl. accessories) | 41 kg | |
| Empty Weight of Product | 38 kg | |
| Weight Ready for Operation (filled) | 44 kg | |
| Physical Dimensions | Total Height (D) | 720 mm |
| Width (B) | 386 mm | |
| Depth from Wall (A) | 125 mm | |
| Height to Bottom of Connections (C) | 440 mm | |
| G20 Natural Gas Performance | Gas Connection Pressure, G20 | 2.0 kPa (20.0 mbar) |
| NOx Emission, Weighted, G20 | 27.30 mg/kWh | |
| 30% Efficiency, G20 | 109.4 % | |
| Max. Gas Volume Flow (DHW generation) | 4.32 m³/h | |
| Nominal Heat Output Range (40/30 °C) | 5.2 to 37.8 kW | |
| Nominal Heat Output Range (50/30 °C) | 5.0 to 37.7 kW | |
| Nominal Heat Output Range (60/40 °C) | 4.8 to 36.4 kW | |
| Nominal Heat Output Range (80/60 °C) | 4.5 to 34.9 kW | |
| Nominal Heat Input Range for Heating (Hi) | 4.8 to 35.7 kW | |
| Nominal Heat Input Range for Heating (Hs) | 5.3 to 39.6 kW | |
| Min. Flue Gas Mass Flow Rate | 2.22 g/s (7.99 kg/h) | |
| Max. Flue Gas Mass Flow Rate | 20.55 g/s (73.98 kg/h) | |
| Max. Heat Output for Domestic Hot Water | 45.3 kW | |
| Nominal Heat Input for Domestic Hot Water (Hi) | 40.8 kW | |
| Nominal Heat Input for Domestic Hot Water (Hs) | 45.3 kW | |
| Heating Adjustment Range | 4.8 to 35.7 kW | |
| Heating System | Max. Flow Temperature | 85 ℃ |
| Flow Temperature Adjustment Range (Factory: 75 °C) | 30 to 80 ℃ | |
| Permissible Operating Pressure, Heating | 0.25 MPa (2.50 bar) | |
| Nominal Circulation Water Volume (ΔT = 20 K, 80/60 °C) | 1,537 l/h | |
| Approx. Condensate Rate (pH 3.5-4.0, 50/30 °C) | 3.6 l/h | |
| Remaining Pump Head at Nominal Circulation Water Volume | 0.025 MPa (0.250 bar) | |
| Electrics | Rated Voltage | 230 V~ |
| Mains Frequency | 50 Hz | |
| Permissible Connected Voltage | 190 to 253 V~ | |
| Built-in Fuse (Slow-blow) | 4 A | |
| Max. Power Consumption in Heating Mode | 110.4 W | |
| Max. Power Consumption in Domestic Hot Water Mode | 134 W | |
| Electrical Standby Energy Consumption | < 2 W | |
| IP Rating | IPX5D |
Vaillant EcoTEC Plus 635 Boiler Details
The Vaillant EcoTEC Plus 635 boiler features advanced Sitherm Pro™ technology for intelligent combustion optimization. This system dynamically adjusts the combustion process, making manual gas-air ratio adjustments unnecessary within the same gas family and ensuring highly efficient and reliable operation.
Equipped with a sophisticated digital display and intuitive controls, the boiler provides users with easy access to various functions. Dedicated buttons allow for activating standby mode, performing resets, setting desired temperatures, navigating menus, and accessing help functions.
The display utilizes a range of symbols to provide immediate visual feedback on the boiler's status. These include indicators for burner modulation, current system pressure, active heating and domestic hot water (DHW) modes, comfort mode, and alerts for maintenance or potential faults.
An intelligent operating concept underpins the user interface. Adjustable values and list entries are easily navigated and modified using a scrollbar, enhancing user experience. To conserve energy, the controls dim after a period of inactivity.
For added security and to prevent unintended alterations, the boiler offers a button lock function. This feature protects the control panel, requiring a specific code for access, thus safeguarding preferred settings.
The EcoTEC Plus 635 seamlessly integrates with the Vaillant sensoROOM pure (VRT 50/2) room temperature control. This allows for sophisticated scheduling of heating, including the configuration of daily or weekly time periods, and features a convenient time programme assistant.
When generating domestic hot water (DHW) through a connected cylinder, the boiler's Comfort mode can be activated. This mode maintains the hot water generation system in a ready state, significantly reducing wait times for hot water at the tap.
A crucial safety feature for systems with a shift-load cylinder is the automatic anti-Legionella function. If the water temperature in the cylinder drops below 50 °C for 24 hours, the boiler automatically heats it to 70 °C to prevent Legionella growth.
The boiler provides useful energy consumption data, including gas and electrical power usage for both heating and domestic hot water. These approximate values, extrapolated through internal algorithms, can be viewed for periods like today, yesterday, last month, or annually, offering insights into energy efficiency (though not suitable for precise billing).
Multiple safety devices are integrated to ensure reliable operation. These include automatic shutdowns for electrical supply failures, robust overheating protection, and built-in frost protection that intelligently activates the pump and burner at low temperatures to prevent freezing.
A dedicated condensate drain blockage safety feature automatically halts boiler operation if the condensate drain becomes obstructed. In freezing conditions, blockages can often be resolved by applying warm cloths to the external pipe, followed by a simple boiler reset.
Designed for optimal safety and performance, the EcoTEC Plus 635 is intended for room-sealed installation (Unit types C13, C33, C43, C53). This configuration ensures that combustion air is drawn exclusively from outside the building, maintaining indoor air quality.
To ensure long-term reliability and efficiency, the boiler requires an annual inspection and maintenance by a competent person. The system provides digital maintenance messages to alert users when servicing is due.
The product is backed by a two-year parts and labour guarantee. To validate this warranty, the boiler must be serviced annually by a qualified professional, and registration with Vaillant is required within 30 days of installation.
Despite its primary setup for natural gas (G20), the Vaillant EcoTEC Plus 635 boiler is convertible to operate with Liquefied Petroleum Gas (LPG). This flexibility requires a specific conversion set and adherence to dedicated installation instructions.
Frequently Asked Questions (FAQs)
Can't find the answer you need? Here are some frequently asked questions about the Vaillant EcoTEC Plus 635 Boiler, and we answer them below.
