Space-Saving Sizes: Smaller homes can get on-demand access to hot water without having to dedicate a large area to a bulky water tank.

If you don’t have a go-to plumbing company, take some time to research local options and compare the pricing, installation process, and warranties of each before deciding on the right company to complete the work.

When a number of pressure-drop-activated trap seal primers are located close to one another, they can be primed via a multiple trap primer (see Figure 1007.1d). In this case, a metered amount of water from the trap primer is evenly distributed to more than one floor drain trap by means of a distribution unit or an electronic primer manifold. For every 20 feet of floor drain trap make-up water line, the primer must be a minimum of 1 foot elevation from the finished floor. It should generally be mounted level with the water supply line.

When a tank-style water heater reaches the end of its life, the heating system’s efficiency is often greatly diminished as the worn-out heater attempts to keep up with demand. It may be time to familiarize yourself with tankless water heater pros and cons so you can decide whether to replace your water heater with a model similar to what you have or possibly switch to a tankless water heater.

tankless waterheater中文

Several tankless water heaters are available and can be differentiated based on how they heat water, the fuel used, and whether the unit is designed for whole-home or point-of-use heating.

However, when considering the high price of a tankless water heater, it’s also necessary to remember that these systems are more efficient than a traditional tank-style water heater, so you reduce your yearly energy costs and save money in the long run.

Gas tankless water heaters burn propane or natural gas to heat the water as it flows through the system. There are non-condensing and condensing options:

Pressure-drop-activated trap seal primers are usually brass, have a one-half-inch Mail Iron Pipe (MIP) inlet connection, and one-half-inch Female Iron Pipe (FIP) outlet connection. An interior cartridge seals when the line pressure is in a static state, but when the line pressure drops just three psi (20.68 kPa) by the flushing of a toilet, a faucet opened, etc., the cartridge will rise. It rises because a pressure differential has occurred within the primer. At this point, a metered amount of water is discharged under pressure into the line connected to the floor drain trap.

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The trap primer must be accessible. The access door needs to be large enough to allow the plumber to reach the trap seal primer, the line shutoff valve and any other accessories present. Installing a line shutoff valve will make repair and maintenance that much easier.

A tankless water heating system is a relatively new product developed with several fundamental changes to improve the way water is heated in your home.

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High-Efficiency and Energy-Saving Designs: Tankless water heaters help reduce energy costs and keep more money in your pocket. They only activate when hot water is needed instead of continuously using energy to heat and reheat a standing tank of water, even when hot water isn’t being used.

It is clear that traps can easily dry up in rooms where floor drains are seldom used, but it may not be obvious that traps dry up in rooms that are used daily. This is a common problem in mechanical and service rooms, which are often dry and overly warm. Years ago, traps would be regularly replenished on the janitor’s nightly rounds. Enough of the soapy water from those old fashioned heavy mops would go down the floor drain to replenish the trap. Today, with the popularity of dry chemicals for cleaning, not much water is used on the floors, at least not enough to keep the traps seal full. By providing a trickle of water every time water is used, trap seal primers refill the seal of a P-trap.

The price of these systems can increase or decrease depending on the size, flow rate, fuel, and type, so it’s important to discuss your options with a professional plumber before deciding on the best tankless water heater for your home.

1. Pressure drop activated. 2. Flush valve operated. 3. Multiple and electronic activated.

1007.0 Trap Seal Protection. 1007.1 General. Floor drain or similar traps directly connected to the drainage system and subject to infrequent use shall be protected with a trap seal primer, except where not deemed necessary for safety or sanitation by the Authority Having Jurisdiction. Trap seal primers shall be accessible for maintenance.

Due to this heating method, tankless water heaters don’t need to be active constantly. Additionally, there’s no limit to the amount of hot water, so users don’t need to worry about running out midway through a shower. Find out more about tankless water heater pros and cons to help you decide if a tankless system is right for your home.

Limitless Hot Water: Users don’t need to worry about the shower suddenly getting cold, which can happen when a tank-style water heater runs out of hot water.

Electric Tankless Water Heaters don’t rely on a heat exchanger. Instead, the water rapidly heats when it flows directly through the electric heating element inside the tankless water heater. These systems are typically less expensive to install than a gas tankless water heater but more expensive to buy.

Marcus Reeves is an experienced writer, publisher, and fact-checker. He began his writing career reporting for The Source magazine. His writing has appeared in The New York Times, Playboy, The Washington Post, and Rolling Stone, among other publications. His book Somebody Scream: Rap Music's Rise to Prominence in the Aftershock of Black Power was nominated for a Zora Neale Hurston Award. He is an adjunct instructor at New York University, where he teaches writing and communications. Marcus received a Bachelor of Arts degree from Rutgers University in New Brunswick, New Jersey.

One of the main drawbacks preventing people from switching to a tankless water heater system is that it costs about three times as much to purchase and install as a tank-style water heater. According to HomeGuide, the average cost to install a tankless water heater ranges from about $800 to $3,500.

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These multiple units can be installed in a variety of situations. For example, such a unit is useful when a men’s restroom is located next to a women’s restroom. In this instance, one trap seal primer can serve both floor drain traps, omitting the need for additional trap primers, extra shutoff valves, another access door and air gap fittings, which saves time, money, and labor. They can also be installed with an electronic timer to provide automatic filling of the trap seal. In this installation there is no worry about having enough pressure drop or use of the fixtures to keep the trap filled.

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Tankless water heatervs tank

Tankless water heaters take up much less space than traditional tank-style heaters and are typically more efficient. These systems heat water as needed instead of continually maintaining the heat level of an entire tank of water. On-demand hot water is achieved by running a cold water line into the tankless water heater so that the water flows through the heating element. The element rapidly heats the water during the brief period when the water is inside the heater. The heated water exits the water heater and flows to the open faucet.

On-Demand Heating: The user can turn on any hot water faucet and instantly get hot water. Tank-style water heaters take more time to heat the water stored in the tank.

Most plumbing companies can remove an old tank-style water heater and install a new tankless water heater, although the cost of this service varies depending on the size, type, and fuel the water heater uses. For instance, while a non-condensing tankless water heater is more affordable than a condensing unit, you might end up paying more for labor to have a non-condensing water heater installed because a stainless-steel exhaust system is required for it to function properly.

Water Heater

Floor drain traps that do not connect to a watersupplied fixture will tend to evaporate. Other traps that are not periodically used or are installed in overly dry areas will lose their seal by simple evaporation. The result of this loss of trap seal allows known health hazards such as hydrogen sulfide, methane, bacteria, viruses and mold to enter the living space. The SARS epidemic (Severe Acute Respiratory Syndrome) reported in Hong Kong, China in 2003 caused in part by a dry and leaking trap, has raised the awareness of the dangers of an unprotected sanitary drainage system.

The flush-valve-operated trap seal primer gets its name from its installation (see Figure 1007.1c). It is placed below the flush valve on a water closet or urinal and connects to the floor drain by a tube so that the tube can catch some of the water discharged from the flush valve. The water runs down the tube to the floor drain and the water seal is maintained. This trap seal primer has two positive features: 1) low water consumption since it only uses a portion of the discharged water from the flush valve operation, and 2) no moving parts. However, this trap seal primer also introduces some restrictions. Its use may not be practical because the flush-valve may be situated too far from the floor drains. In this case, a pressure-drop-activated trap primer is more practical since it can be installed close to the drain that needs to be primed.

One of the first lines of defense against trap failure is the trap primer, which is a piping device that helps to maintain a water seal in a remote trap. A trap primer connects to a cold water inlet or other water supply. Every time that inlet or supply is used, a small amount of water flows down to the trap to keep the water seal from drying up. If the primer is electronic, it is set on a timer that daily releases enough water to maintain the trap seal (see Figures 1007.1a and 1007.1b).

Making the correct choice of which trap primer to use should take some thought. There are three main kinds of trap seal primers:

Multiple Units for Larger Properties: Generally, larger homes and families will have a higher demand for hot water. To keep up with this demand, you may need to install more than one tankless water heater or invest in a high-end tankless water heater with a very high flow rate. This ensures water is heated to an optimal temperature. A family with four people in a home with four or fewer bathrooms shouldn’t require more than one tankless water heater.

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While there are several key benefits of tankless water heaters, several limitations might cause you to reconsider whether a tankless water heater is the right choice for your home.

When installing a tankless water heater, homeowners are eligible for a federal rebate of 30% of the project cost, with the average being $600.

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Point-of-Use Tankless Water Heaters are smaller alternatives to whole-home tankless water heaters. As the name suggests, instead of heating the water for the entire home, point-of-use water heaters are set up near a single faucet, shower, or appliance to rapidly heat the water at the point of use.

An important consideration when purchasing a tankless water heater is the installation process. Due to the complexity of the project and the professional know-how necessary to ensure a water heater is working correctly, it isn’t recommended that a DIYer attempt to install one.

Limited Flow Rates: Reduced flow rates can lead to poor heating efficiency and low-temperature water. Before deciding on a tankless water heater, ask an experienced plumber about the appropriate flow rate for your home. Remember that, in most cases, the higher the flow rate, the more costly the water heater.

Maintenance on a tankless water heater averages $45 to $200 per year for a professional to visit your home and service your unit. Most models will have a five-year chamber and one-year parts warranty. If you want an extended warranty, check with your dealer to see if one is available before purchasing.

Long-Lasting Durability: Tankless water heaters last for up to 20 years before needing to be replaced. For comparison, tank-style water heaters have an average life of about 12 years.

Pressure drop activated trap seal primers are designed to minimize the problem of clogging. These trap seal primers are constructed with a fine mesh filter, keeping line debris at bay.

High Purchase and Installation Costs: The price of a tankless water heater can be a restrictive factor. Installing a tank-style water heater typically costs about $900, while the average cost to install a tankless water heater can exceed $3,000.