Bottom-hung tilt-in window in Rehau Synego

SYNEGO is Rehau's uPVC window and door system: 80 mm frame depth, 7 chambers in the outer frame and 6 in the sash, glass up to 51 mm, and Uf 0.94 W/m²K in the MD version. The face of frame and sash together is 117 mm as standard; the data sheet gives a range of 109 to 175 mm, and 144 to 218 mm on a French casement (figures given by Janwillem on 14 September 2026 from the Rehau data sheet). It has been tested up to burglar resistance class RC3, one class higher than most uPVC profiles in our range. SYNEGO profiles carry Rehau's EcoPuls label: according to the manufacturer, the profile is therefore more than 40% recycled material — a claim we take from the manufacturer's brochure and have not measured ourselves.

Rehau's uPVC window: 80 mm frame depth, 7 chambers and Uf 0.94 W/m²K.

A bottom-hung window has its hinge at the bottom instead of the side, and that makes it the window for the spot you'd rather not reach with a handle.

A bottom-hung window tilts open inward from the top, with the hinge on the sill. That is the exact opposite of a side-hung casement, which is hinged at the side. The practical result: you can fit a bottom-hung window high in a wall — above a basin, in a WC, above a kitchen worktop — and still operate it without a sash swinging into the room at head height. The opening is set to one fixed gap, not a range of positions as with tilting.

The standard size is 1,100 × 800 mm: wider than it is tall, to suit the narrow strips where a bottom-hung window usually goes. Choose one if you're mainly after ventilation in a spot where you rarely or never look out, and not if you also want to clean the glass from inside there — for that you need to be able to reach the window, as with a side-hung casement.

All about the Rehau Synego profile All about the bottom-hung tilt-in window layout