Top outlet bunded oil tanks are quite simply oil tanks which have the outlet to the burner placed at the top, rather than the bottom of the tank. Oil is then drawn out, as opposed to being gravity fed through the outlet at the bottom. All Harlequin bunded oil tank models can be provided as either top outlet (ITT) or bottom outlet (ITE) tanks.
Top outlet oil tanks are suitable for use with most pressure jet burners - we recommend installing a Tiger Loop de-aerator, to eliminate the need for a return line to the tank. Pressure jet burners are fitted to most oil boilers sold today in the British Isles.
Top Outlet Bunded Oil Tanks are not compatible with vapourising (or wick) burners, fitted to some oil-fired stoves. At such installations, a bottom outlet bunded oil tank should be fitted or else an oil lift device should be incorporated within the oil supply line.
If you are in any doubt as to the compatibility of top outlet or bottom outlet bunded tanks, consult the appliance manufacturer or OFTEC.