Water Saving Toilets

The Most Water Efficient Toilet Models and Their GPF Averages

High-efficient-toiletHaving a HET (High-Efficiency Toilet) of 1.26 gallons can save you up to sixteen thousand five hundred gallons of water on a yearly basis above the amount that toilets which are less efficient and found in over half of the homes in the United States will save.

According to United States federal law, a toilet can use at the most 1.6 gpf (gallons per flush). Due to this requirement most toilets available on the market are 1.6 gpf there are however even better options available, options which require much less to flush. There are even some dry toilets whose gpf is as low as 0.2. I think we can all agree that this is more efficient than the toilets manufactured in the nineties whose gpf is as high as five gpf.

Although the standard in the United States is 1.6 gpf a toilet which is water efficient does not need this amount in order to properly flush. Here is a list of various toilet models as well as their gpf, this will be of assistance when it comes to choosing which toilet will work the best and save you the most.

Toilet Models and Their Average Use of Water

Gravity Fed

GPF = 1.28 out of 1.6

This average and relatively conventional toilet model has a holding tank for water which uses gravity to pour water into the toilet bowl when it is flushed. After flushing the water tank refills stopping once it has reached a certain tank level.


GPF= 1.1 out of 1.6

Although the pressure assist model also has a tank, there is pressurized air inside a receptacle within the tank. When the toilet is flushed the pressurized air is released, this assists in the water being flushed out.

Dual Flush

GPF= 1.0 out of 1.6

This gravity fed toilet has two buttons; one is used to flush liquid wastes and the other solid wastes. This dual flush toilet uses 1.6 gpf when flushing solid wastes and 1.0 gpf when flushing liquids making the gpf average 1.28 or lower.

High-Efficiency Toilet (HET)

GPF= Varied but low

These toilets use twenty percent less amount of water then the standard 1.6 gpf toilets. There are many that use even less, only 1.1 gpf.

The Environmental Protection Agency’s label for fixtures and appliances which are water efficient is WaterSense. HETs which meet high standards for not only performance but also efficiency and warranty and use twenty percent less water are labeled.

You can save up to four thousand gallons of water a year by installing one of these toilets, this will save you around ninety dollars on your water bills.

Composting Toilet

GPF = 0

These innovative toilets use hardly any if any water at all to flush being as the way in which waste is eliminated is through decomposition which is of course the natural process. The waste may be directly transferred to the ground or it may be stored in a tank which will be used for composting at a later date.