Which flushing types use the least amount of water?
Toilets will either come in single or dual-flush models. From there, the types of flushing technology will further determine how eco-friendly your toilet is.
Gravity-Assist Toilets - Like the name suggests, gravity is the worker in this low-flow toilet type as gravity ushers water from the tank into the toilet to whisk the contents away through the trapway. It’s often found in single flush toilets and as the half flush in many dual-flush toilet models. Since this isn’t a “power” flush, you may find that you need to flush more than once on occasion to fully clear your toilet. This is the lowest cost option and it’s the most common, so it’s also easy and affordable to fix if any issues arise.
Dual-Flush Toilets - A dual-flush toilet, sometimes called the double-flush toilet, often has two flush buttons or a lever with two distinct levels of a flush. It marries a gravity-fed flush for the half flush meant for liquid waste (approx. 0.8 - 1 gpf) with pressure-assisted flushing mechanisms for a full flush for larger loads (1.28 - 1.6 gpf). Dual-flush toilets are growing in popularity due to the water savings they offer (about 20 percent less water than the conventional single flush options), though they are a little more expensive.
Pressure-Assisted Toilets - Waste doesn’t stand a chance against pressure-assisted toilets. This is the powerful flush using pressurized air to force the water and waste down harder and faster for a more efficient flush. Pressure-assisted toilets are not very quiet, but they get the job done with fewer clogs and less water. Thanks to using a plastic insert to hold the water, these toilets also won’t sweat, making them even more eco friendly. Pressure-assisted options cost on average 30 percent more than conventional toilets and also cost more to fix.
Vacuum-Assisted Toilets - A brand new option on the market, vacuum-assisted toilets have the power of the pressure-assisted toilet in clearing waste from the bowl but without the noise. Vacuum-assisted toilets suck the water and waste from below, rather from the top. This flushing technology is highly efficient and most models use 0.8 gpf or less, making it one of the most eco-friendly flushing technologies available.
Double-cyclone Toilets - Another newer technology, double-cyclone toilets use minimal water for a powerful and efficient flush via two “cyclone” nozzles to usher the water and waste down the piping, as opposed to the little holes in the rim where water is usually pushed through in other models.