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Best Water Saving Devices for Older Toilets and Showers
The best water saving devices are simple, cheap retrofits that cut the water each flush or shower sends down the drain, and this short roundup covers five of them. The picks fall into two groups: tank inserts for older, high-volume toilets, and a collector that captures the cold water that runs before a shower warms up. Budget-minded renters, homeowners with dated bathrooms, and anyone on a metered water supply will find a fit below. The overview table shows the differences at a glance.
Overview of the Picks
| Product | Key Spec | Best Use | Price Tier |
|---|---|---|---|
| Toilet Tank Bank Insert 3-Pack | 3-pack, saves 95+ ounces per flush | Multi-toilet homes on a budget | Budget |
| Niagara Conservation Water Saving Toilet Tank Bank | Single tank bank | Testing one toilet first | Budget |
| Shower Flower Warm up Water Saving Device | Compact warm-up collector | Showers that run cold for a while | Premium |
| Niagara Conservation Toilet Tank Bank 2-Pack | 2-pack tank banks | Two-bathroom homes | Budget |
| Honeydak 6 Pack Toilet Tank Insert | 6-pack, 2.3L inserts | Large households and rentals | Budget |
1. Toilet Tank Bank Insert 3-Pack
Type: Toilet tank displacement insert
Pack Size: 3 inserts
Claimed Savings: 95+ ounces per flush
Alternative To: Brick and bottle methods
Intended Use: Less efficient older toilets
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This three-pack takes the classic displacement idea and turns it into a sealed, refillable insert that sits in the tank and takes up space the water would otherwise occupy. Each unit is built to displace a fixed volume per flush, which is the same trick as dropping a brick in the tank but without the crumbling, sediment, or awkward fit. The soft-sided construction is meant to survive years of sitting in standing water. It suits owners of older toilets who want to cut usage across several bathrooms without buying a new fixture.
Trade-off: Displacement only works well in tanks that currently hold more water than the bowl needs, so a modern low-flow toilet may see weak flushes rather than savings.
2. Niagara Conservation Water Saving Toilet Tank Bank
Type: Toilet tank bank
Pack Size: Single unit
Brand: Niagara Conservation
Intended Use: Toilet tank displacement
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The single Niagara tank bank is the cheapest way to try displacement on one toilet before committing to a multipack. It is a hanging-style bank that fills with air or water and hangs from the tank wall, so it takes up volume without resting on the bottom where it could interfere with the flapper. The brand is one of the better-known names in conservation fixtures, which counts for something when the part sits in water for years. It suits a household that wants to test the idea on the worst offender first.
Trade-off: One unit covers one toilet, so a whole-home fix means buying several, and the hanging design can shift if the tank is unusually shallow.
3. Shower Flower Warm up Water Saving Device
Type: Shower warm-up water collector
Design: Compact
Function: Collect and reuse pre-warm-up water
Intended Use: Showers with a long warm-up run
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The Shower Flower tackles a different waste stream: the cold water that runs down the drain while the shower heats up. It is a compact collector that sits in or near the shower and holds that water so it can be used for plants, cleaning, or flushing instead of vanishing. The small footprint means it stores out of the way between uses. It suits anyone whose shower takes a while to run warm, which is common in older plumbing and on upper floors.
Trade-off: It only saves the warm-up volume, so the savings are modest next to a toilet retrofit, and the unit has to be emptied and rinsed regularly to stay hygienic.
4. Niagara Conservation Water Saving Toilet Tank Bank 2-Pack
Type: Toilet tank bank
Pack Size: 2 units
Brand: Niagara Conservation
Intended Use: Toilet tank displacement
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The two-pack is the same Niagara tank bank in a quantity that covers a typical two-bath home. Buyers get the hanging design and the established conservation brand without paying per-unit prices, which makes it the sensible middle option between a single test unit and a bulk pack. Two units also let a household treat the guest bath and the main bath separately and judge results toilet by toilet. It suits owners of two older toilets who want a matched pair.
Trade-off: The per-unit saving is smaller than the six-pack, and two units still leave larger homes short if every bathroom needs one.
5. Honeydak 6 Pack Toilet Tank Insert
Type: Toilet tank insert
Capacity: 2.3L per insert
Pack Size: 6 inserts
Color: Blue
Alternative To: Brick and bottle methods
Intended Use: Less efficient older toilets
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The Honeydak pack is the bulk option, with six blue inserts that each hold a stated 2.3 liters of tank volume. That quantity covers a large house, a rental property, or a small building where every toilet is an old high-volume model. The inserts are a straightforward drop-in replacement for the brick-and-bottle habit, with a fixed capacity that makes results easier to predict than a homemade bottle. It suits landlords and big households who want to treat every tank in one order.
Trade-off: Six inserts is more than most single-family homes need, and the fixed 2.3L displacement can be too much for a tank that is already marginal on flush power.
Before You Buy
- Tank size: Measure how much water the tank holds and how well it flushes now; displacement works best where there is surplus volume to spare.
- Flush performance: Test one insert per toilet first and watch for weak or double flushes before adding more.
- Compatibility: Check that a hanging bank clears the flapper and fill valve, and that a drop-in insert does not block the inlet.
- Material and water contact: Choose sealed inserts over bricks, which crumble and leave sediment in the tank and valve.
- Care: Rinse collector-style devices regularly and check tank inserts for buildup every few months.
- Included accessories: Confirm how many units come in the pack against the number of toilets or showers being treated.
- Household fit: Renters should favor removable inserts over anything that needs plumbing changes.
Frequently Asked Questions
- Do toilet tank banks really save water? Yes, in the right toilet. They displace tank volume so each flush uses less, but the saving only holds if the toilet still flushes cleanly afterward.
- Are these devices safe for modern low-flow toilets? Usually not recommended. Toilets already designed to use little water have no surplus to give up, and adding displacement can cause weak flushes.
- What is the difference between a tank bank and a bottle? A tank bank is a sealed, purpose-made insert that will not crumble or leak, while a plastic bottle works but can shift and is harder to size consistently.
- How much does a shower warm-up collector save? It captures only the cold water that runs before the shower heats, so expect a small but repeatable saving rather than a large one.
- How many inserts does a typical home need? One per toilet. A single unit suits a test, a two-pack covers a standard two-bath home, and a six-pack fits larger households or rentals.
- Will these devices lower a water bill? They can, especially on metered supply and in homes with older fixtures, but the effect depends on how many flushes and showers the household runs.
Bottom Line
For most households the Toilet Tank Bank Insert 3-Pack is the top pick: it covers several bathrooms at a budget price, uses sealed displacement instead of a crumbling brick, and is easy to remove if a toilet flushes poorly. Buyers with only one old toilet should start with the single Niagara bank, and anyone fighting a long cold shower run should add the Shower Flower alongside it.
