Hayward H-Series Heater H400FDN Hayward is always looking for ways to make pool and spa ownership as simple and effortless as possible. The latest example of this is the new Universal H-Series pool and spa heater. To view these documents, you will need to download the free Acrobat Reader, which gives you instant access to PDF files.The Model numbers for the products below are those that have manuals available in PDF form. Hayward H400FDN Universal H-Series 400,000 BTU Pool and Spa Heater, Natural Gas, Low Nox. 3.7 out of 5 stars 511. $2,278.00 $ 2,278. 00. FREE Shipping. Only 1 left in stock - order soon. Hayward HP21404T HeatPro Titanium 140,000 BTU Heat Pump, Square. Read and follow all instructions in the service and installation manual and on the Hayward Part # FDXLFSKF30 (Qty. 10) Step 1: Page 14 Verify incoming voltage to heater is present (110-125 or 220-245 VAC), if voltage is present, proceed to Step 2. Otherwise, correct incoming line The Hayward Universal H-Series gas heater is the "universal" energy efficient remedy for any new or existing pool or spa. An industry leading hydraulic design reduces circulation pump run time to provide energy savings of up to 18% when compared to less efficient competitors. Hayward H400FDN Universal H-Series Natural Gas Heater (400K BTU) SKU: H400FDN eliminating the need to install a high-wind stack. Year Limited Warranty on Product, see Owner's Manual for a full description of warranty claims and coverage details. Documents. DON'T get the Hayward H400FDN 400,000 BTU Pool Heater until you've checked out the reviews first. Hayward Universal H-Series Pool Heater Installation - AmeriMerc.com - Duration: 20:31 H-Series Sizing and Install Site Is the Hayward H400FDN the correct size heater for your pool? The H400 is one of seven sizes of H Series Pool Heater. It is aimed at large pools or those that wish to heat their pool or spa rapidly. Hayward's 100 000 BTU Natural Gas induced draft Hayward's 100 000 BTU Nat