Thermistor Compatible Replacement for Hayward H-Series Low NOx Pool & Spa Heaters Compatible Replacement for Part No : IDXLTER1930 Compatible Replacement for Hayward H-Series Low Nox Heaters. Includes 1 Roll of Teflon Tape for installation. Manufactured by Optimum Pool Technologies. Compatible Repalcement for: H-Series Electronic ED2 Style, Low Nox Induced Draft Heaters, H250IDL2/H350IDL2/H400IDL2 Pool and Spa/Hot Tub Heaters, Electronic Ignition H150/H200/H210/H250/H300/H350/H400 Pool and Spa/Hot Tub Heaters NOTE: This is a compatible aftermarket replacement part. The manufacturers' names and part numbers have been used for reference purposes only. Optimum Pool Technologies Inc is an independent brand. Optimum Pool Technologies Thermistor Compatible Replacement for Hayward, Compatible Replacement for H-Series Electronic ED2 Style, Low Nox Induced Draft Heaters. Compatible Replacement for: H-Series Electronic ED2 Style, Low Nox Induced Draft Heaters, H250IDL2/H350IDL2/H400IDL2 Pool and Spa/Hot Tub Heaters, Electronic Ignition H150/H200/H210/H250/H300/H350/H400 Pool and Spa/Hot Tub Heaters