Rinnai Zen 35kW Natural Gas Combi Boiler – ZEN35-NG 98% Efficient WiFi ME Controller ErP A Compact 35kW natural gas combination boiler for small to medium properties with one bathroom. 98% efficiency. ErP A-rated heating and hot water. Rinnai ME WiFi controller included — iOS and Android app, IoT/GPS control, eco function, energy monitor. Weather compensation, fast heating mode and DHW pre-heat built in. 14L/min hot water at 35°C rise. 60/100 coaxial condensing flue. IPX5. 1-year labour, 7-year parts warranty. The Rinnai Zen 35kW is one of the most compact combination boilers on the market — 660 × 440 × 285mm — for installations where space is limited. As a condensing combination boiler it provides both central heating and domestic hot water from the mains wi