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A white Vaillant ecoTEC Plus 840 40kW combi gas boiler is shown on a green-yellow gradient background with text: "Fully Fitted" and "£0 Deposit." Product name is displayed at the bottom.

Vaillant ecoTEC Plus 840 40kW Combi Gas Boiler

£3,500.00

High-output combi for very large homes, with premium efficiency and smart technology.

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Solar Panels & Boiler Installations Nationwide

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The Vaillant ecoTEC Plus 840 40kW Combi Gas Boiler is a premium condensing combi boiler for very large homes with up to 18 radiators and 2-3 bathrooms. It delivers a hot water flow rate of 16.3 litres per minute at 35°C and a 94% seasonal efficiency rating (ErP A-rated). Measuring 720x440x406mm and weighing 38kg, it’s slightly larger but suitable for wall-mounted installation. It includes ioniDETECT technology, a stainless steel heat exchanger, a 1:10 modulation range, and a semi-touch interface. Quiet Mark certified, it supports myVAILLANT app control and hybrid systems, and is 20% hydrogen-prepared. It supports natural gas only and offers a 5-year warranty, extendable to 10 years with a Vaillant Advance installer. Ideal for expansive homes with significant hot water needs.

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