The Vaillant ecoTEC Plus 435 is a high-capacity 35kW heat-only boiler engineered specifically to supply robust natural gas heating for expansive domestic and demanding light commercial applications. Constructed internally with an advanced aluminium heat exchanger, this reliable wall-mounted unit achieves an exceptional SAP A/D ErP rating, safely generating up to 126,500 BTU while rigorously maintaining low Class 6 NOx environmental emissions. The system boasts an impressively wide internal modulation range of up to 1:6, allowing it to finely tune its thermal output during periods of low heating demand to drastically reduce overall gas consumption.

Measuring exactly 602x375x320mm and weighing 23kg, the appliance features a versatile push-fit concentric flue system that provides substantial physical installation flexibility across challenging structural locations. Heating engineers benefit greatly from the built-in two-stage frost protection and completely removable side panels that grant comprehensive internal access during routine mechanical maintenance. Equipped with a large backlit plain text display and full digital compatibility with all modern Vaillant smart controls, this WRAS-approved unit operates at a highly discreet 53 dB(A) acoustic noise level.

Q: What material is the internal heat exchanger made from?
A: The boiler utilises a highly efficient internal aluminium heat exchanger.

Q: What is the modulation range of this appliance?
A: It features a wide operational modulation range of up to 1:6 to optimise fuel efficiency.

Q: Does the unit offer dedicated frost protection?
A: Yes, it strictly includes built-in two-stage frost protection to prevent internal freezing in cold conditions.

Q: What is the recorded operational noise level?
A: The boiler is specifically engineered for incredibly quiet operation, producing approximately 53 dB(A).