The iN501 Neuron
Guaranteed to replace comparable tank-type units.
Drop-in ready, the Neuron line packs the energy-saving benefits of tankless units in a reliable design that installs quickly. With the same connections as a traditional boiler for quick startups, and no tank to maintain, the Neuron Series drops in like a breeze.
iN401 Key Features:
- Guaranteed Replacement Product: Guaranteed to replace comparable tank-type units. Click here to find eligible models that qualify for the guarantee.
- Prodigious Performance: 500,000 BTUs/hr. at 96% thermal efficiency and a turndown ratio of 16.7:1
- Lightning-fast Lead Times: Replace outdated tanks immediately. No month-long delays for delivery.
- Fast & Familiar: Designed to mimic the piping connections of traditional tanks, the Neuron series units cut down installation time by 50%. A familiar design makes operation and maintenance easier.
- Cascades and Integrates Easily: Up to 4 units can be cascaded easily with common venting for a combined output of 2 million BTUs/hr. Masterless cascading ensures zero downtime from single-point failures.
- Next-gen Connectivity: Monitor the Neuron units remotely via the telliCare app using Direct Cell-LTE connectivity. Access key operational data like energy usage and flow rates. Monitor serviceable parts' life to schedule maintenance in advance.
- Lightweight & labor-saving: With a weight of 345 lbs., the Neuron units can be easily transported without heavy machinery. The units can easily fit through standard elevator doors.
- ASME-Certified Peace of Mind: The iN501 offers the above benefits with the added peace of mind of an ASME certification.
Your Trusted Business Partner.
Watch & find out how the Neuron Series can be every business' best friend.
Everyone Wins With the Neuron Series.
Returning contractors can earn up to $250 for every installation of the iN501.
Everyone Wins With the Neuron Series.

- First-time installers can earn up to $1000.
- Returning contractors can earn up to $250 for every installation.
Find Your Guaranteed Neuron Replacement:
Make the Right Choice. Quickly. Easily. Remotely.
telliSize
Designed for contractors and service providers, telliSize allows instant tankless sizing of commercial properties online. Enter some basic details and receive multiple tankless choices with detailed schematics. Get guaranteed results – if telliSize’s recommendations fail to deliver the required performance, we pay for any additional equipment or installation costs.