Hot Dawg H2O from Modine has no moving external parts. The unit’s design and low profile allow it to be rotated for either horizontal or vertical air discharge, giving users multiple installation options. Hot Dawg H2O comes in two models, the HHD30, operating at a range of 23,700 to 39,200 Btu/hr., and the high-capacity HHD45, operating at a range of 23,900 to 56,800 Btu/hr., at 180° F of entering water temperature. The HHD45 also includes a speed control which allows the user to receive a range of 425—710 CFM. Modine.