- Upgrades the NSA 300H tank. This tank is exactly the same height as NSA 300H, but it is 3″ larger in diameter, so it fits in most installations with ease. Our tank head has a larger O-ring for a better seal than the NSA 300H.
- Twice the catalytic carbon as NSA 300H-size tanks and lasts twice as long.
- Filters the water better because its media bed is larger, resulting in longer contact time with the water.
- Provides better flow and pressure than NSA 300-size tanks.
- Less maintenance because the larger tank lasts twice as long between replacements, giving you a better value.
- Utilizing catalytic carbon, this unit will filter all the water throughout your entire home.
- Removes chlorine, chloramines, bad taste, and odor from all of your family’s water.
Use the WHR935 for all kitchen water needs (including drinking water, ice, juice concentrates, coffee, tea, cooking), pets, and showering and bathing in clean, chlorine-free water.
H2O WHR935 Whole House Filtration System Replacement Tank for NSA 300H Features:
- Warranted for 2 years of maintenance-free performance (pro-rata) with proper sediment pre-filtration
- 150,000 gallon capacity for chlorine removal
- Made in the U.S.A.
- Intended for use on municipally treated water.
- Do not use on microbiologically unsafe water supplies.
Why Upgrade Your NSA 300H Whole House Filtration System?
An upgrade replacement tank is not only a direct replacement. It is intended to replace a specific tank while improving your system in the long term.
Choose an upgrade when you want to:
- Improve performance based on current household demand
- Replace an older tank with a more current configuration
- Address a mismatch between your system’s capacity and your household usage
- Refresh a system when you are already doing a major replacement
Choose a like-for-like replacement when you:
- Want the same capacity and footprint as your current tank
- Need the most straightforward swap with the least chance of plumbing changes
- Are satisfied with the performance and only need to replace a worn tank
Compatibility and What Changes with the Upgrade
This upgrade is designed to replace a specific whole house tank model in the NSA system family. The key is confirming what you have now and understanding what will change after installation.
Compatibility notes
Confirm your:
- Current model number on the existing tank label, paperwork, or order history
- Current valve and connection size so the tank and fittings match
- Available space for the upgraded tank footprint and height
What can change with an upgrade
- Tank dimensions and footprint
- Media capacity and overall system performance
- Fitting or bypass requirements depending on your current setup
- Service access needs for future maintenance
If your current system is working but feels undersized during peak water use, an upgrade or replacement tank can be a smart way to align the system to your home today.
Install Considerations for the WHR935-NSA Whole House Replacement Tank
Space and footprint
- Measure height and diameter clearance where your tank sits now.
- Confirm you have room to service the valve and access connections.
Fittings and bypass
- Confirm the inlet and outlet size and whether you have a bypass installed.
- Plan for adapters if your plumbing and the upgraded tank connections do not match exactly.
Drain and electrical
- If your system includes a backwashing valve, confirm that drain routing is still correct.
- If your valve is powered, confirm a nearby outlet remains accessible.
Downtime expectations
- Most replacements require shutting off water, depressurizing the system, and swapping components.
- Downtime depends on plumbing access and whether fittings need to be changed.
- Many homeowners schedule replacement during low-use hours to minimize disruption.
Before You Buy the WHR935-NSA Whole House Replacement Tank: Quick Checklist
Use this checklist to confirm fit and avoid ordering the wrong replacement.
- Current tank model number confirmed
- Current valve model confirmed
- Connection size confirmed
- Available clearance measured
- Bypass type confirmed or planned
- Plumbing condition checked for any parts you should replace at the same time
- Installation plan confirmed, DIY vs installer
FAQs on the WHR935-NSA Whole House Replacement Tank
Q: What is the WHR935-NSA replacement tank upgrade used for?
A: It is used to replace an existing whole house tank while also upgrading the configuration for better fit or performance.
Q: How do I know if I should upgrade or replace like-for-like?
A: Upgrade if your current system feels undersized or you want a more current setup. Replace like-for-like for the simplest swap with minimal plumbing changes.
Q: Will this fit my current valve?
A: It depends on your valve model and connection size. Confirm your valve and plumbing size before ordering.
Q: Will the upgraded tank change my system footprint?
A: It can. Always measure your available space and compare it to the upgraded tank dimensions.
Q: Do I need a bypass?
A: A bypass is strongly recommended for service and future maintenance. Confirm whether you already have one and whether it matches your connection size.
Q: How long does installation take?
A: Time varies based on access and whether fittings need to be changed. Many replacements are completed in a few hours, but complex installs can take longer.
