The Duet rigs were developed with John Noad (Building Environment) Ltd of Braintree. They are compact in size and completely pre-plumbed, pre-wired and pre-piped for easy installation — including flow and return pipes to primary heating and the manifold box for the underfloor heating.
The Celsius 25 gas-fired condensing boiler modulates between 7 and 25 kW and serves a Spa unvented hot-water cylinder and underfloor heating at around 35°C.
The Duet rig is available in 125, 150 and 200 litre versions.
