

Ships same day if ordered by 12 pm
Manufacturer pricing rules prevent us from advertising our discount — no account or email required to see it.
Secure Payments
Easy Returns
Expert Advice
Fast Shipping
Lochinvar TST3403 is a flue temperature sensor kit used to monitor flue conditions on Lochinvar Knight boiler systems. The electronic sensor kit functions as a replacement flue sensor and provides temperature sensing for compatible boilers and water heaters, including Knight XL and multiple AW, KB, KBN, KBL, SNA, SNR, and XP series models. Provided as a single kit containing the flue temperature sensor assembly, it is intended for flue temperature monitoring in heating and commercial pool package systems.
Replacement flue temperature sensor kit for Lochinvar Knight boilers; MPN TST3403; electronic flue monitoring.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
Add install kit to cart
—
Thanks for subscribing!
This email has been registered!