These stainless steel heat boosters can increase your universal oil heaters output by 40 by utilizing heat that would ordinarily be released and lost up through the flue the boosters are compatible with all of our universal oil heaters and simply slot in between the heater and the flue use a heat booster and increase your oil heaters efficiency up to a massive 91item no 09129 is suitable for the following universal oil fired heaters sip hp105 09159sip hp115 09177sip hp135 09150sip hp125 0 09161u