Tankless water heater requirements

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The inside of a

hydraulically

operated two-stage tankless heater, heated by single-phase electric power. The copper tank contains heating elements with 18

kW

maximum power.

Tankless water heaters—also called instantaneous, continuous flow, inline, flash, on-demand, or instant-on water heaters are water heaters that instantly heat water as it flows through the device, and do not retain any water internally except for what is in the heat exchanger coil. Copper heat exchangers are preferred in these units because of their high thermal conductivity and ease of fabrication.

Tankless heaters may be installed throughout a household at more than one point-of-use (POU), far from a central water heater, or larger centralized models may still be used to provide all the hot water requirements for an entire house. The main advantages of tankless water heaters are a plentiful continuous flow of hot water (as compared to a limited flow of continuously heated hot water...

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I'm looking at the possibilities of replacing my water heater. Currently we have an electric, 2 element, 50 gallon tank heater that is 32 years old and almost ready to go. The water can sometimes come out milky colored, rust colored, occasionally with rust flakes stopping up filters, etc. And runs about $850 a year in electricity. It still pumps out exceptionally hot water, but we're definitely paying for it.

So currently it's electric with tank hookups; we'd have to reroute the water pipes a little over to the wall and we'd also have to add a gas connection (the main runs directly overtop of where the unit would be. The main gas line comes in nearby at 1" and hits a T above the water heater where a 3/4" line runs to the furnace and a 1/2" line goes to our gas range. I've seen that pressure and such would have to be checked by a professional, but does this sound like it'd leave room for other WH?

Otherwise from what I can see, this is all fine and will work with what...

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Are you upgrading your home with a new tankless water heater system? Tankless water heaters have a number of advantages over traditional water heating systems. Chief among them is the because they eliminate the exorbitant cost of heating and maintaining up to fifty gallons of hot water at a time. Instead, they create hot water quickly and easily on demand. The following installation tips will help ensure you get the installation requirements right the first time.

When installing an outdoor gas tankless water heater, ventilation isn’t necessary. That makes the installation requirements of an outdoor unit simple. When installing one indoors, you’ll need a simple combustion fan and PVC piping that blows exhaust outside. Although most manufacturers advise against venting into a chimney, there are typically two options for safe venting:

You can vent upward through a chimney or roof You can vent horizontally through a side wall

Electric tankless water heater installation...

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Also known as on-demand or instantaneous, on tankless water heaters only provide hot water as needed. Depending on your average daily usage, on demand water heaters can be 10-60% more efficient than standard tank water heaters because you have no standby losses associated with heat escaping from the tank. In the case of a cabin where you might go a week or two between actually using the hot water, savings with on demand will be even greater.

Electric tankless water heaters often provide hot water at a rate of 2-5 gallons per minute. Gas fired on demand water heaters can generate higher flow rates (6.5 to 9.5gpm are common). In our case, natural gas was not available so we chose to go with an electric tankless. Retrofitting an electric on demand water heater into an existing home is often difficult due to the extreme current requirements of these devices. You are looking at 100-150A at 220V to supply an entire house whereas a tank water heater is...

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Water Heater Permit Requirements
The on-line permit is available for properties in Sunnyvale with a residential zoning district. Zoning district information is available on-line by clicking on E-Zoning.

A plumbing permit is required for the replacement of an existing water heater. Permits are required prior to installation or replacement of water heaters.

Following are general requirements for water heater replacements based on the 2016 California Plumbing Code and the 2016 California Energy Efficiency Standards. This brochure is intended to provide general information, contact the Building Safety Division for any questions or additional information.

Seismic Straps (CPC 507.2)
Water heaters require two seismic straps; one located within the top 1/3 of the water heater unit and one at the bottom 1/3. The bottom strap must be located at least 4" away from the water heater controls.

Several seismic strap kits are available commercially; however,...

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A18: Our tankless heaters are designed for an entire home. Our smallest unit can provide up to 6.6 gallons per minute and our largest unit can provide up to 13.2 gallons per minute. Some heaters have the Quick-Connect feature which allows identical heaters to be linked to double its output. So how do you figure out how many gallons of hot water you need for your home? Here are some helpful tips:

1. How much hot water do you use at the same time? A standard shower head, dishwasher, washing machine is about 2.5 gallons per minute each. If you typically use all three of these at the same time, that would require 7.5 gallons per minute or the NR98 series. Bath tubs are usually 6-8 gallons per minute, and rain head showers and body sprays definitely requires more hot water than a standard shower head. So if you demand more hot water you will need a larger sized unit or another identical unit with the Quick-Connect feature.

2. Remember to pick the right size unit for...

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The following Requirements must be adhered to when planning for and installing a Takagi tankless water heater. Failure to do so could result in improper operation, shortened unit life, voiding the warranty and/ or a compromise in safety. Installation requirements for each model can be found on Installation Manual. The following will provide general guidelines.

1. Follow all local codes, or in the absence of local codes, follow the most recent edition of the National Fuel Gas Code: ANSI Z223.1/NFPA 54 in the USA or CAN/CSA B149.1 Natural Gas, Propane Installation Code in Canada. 2. All gas water heaters require careful and correct installation to ensure safe and efficient operation. Read the “Safety Guidelines” Section in the Installation Manual. 3. The manifold gas pressure is preset at the factory. It is computer controlled and should not need adjustment. 4. Maintain proper space for servicing. Install the unit so that it can be connected or removed easily. Refer to the...
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Interested in Purchasing a Tankless Water Heater?

1. What are the power supply requirements for the Rinnai tankless water heater?
Rinnai tankless water heaters require 120 volts AC, 60 Hz and less than 3 amps.

2. Can I install a Rinnai tankless water heater myself?
Improper installation of gas appliances, including, but not limited to Rinnai products, can be extremely hazardous to you, your family and your property. Accordingly, Rinnai recommends that all of our products be installed by a Rinnai trained and licensed contractor or approved and qualified plumber or contractor according to pertinent federal, state, and/or local regulations. Improper installation of your Rinnai product can affect the warranty provided by Rinnai.

3. How much does a Rinnai tankless water heater cost?
The suggested list price for our water heaters tends to range between $900 - $1,995 depending on the model. These prices do not include installation or venting. For a more...

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