Tankless water heater beeps and causes power surge


The inside of a


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


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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Grundfos RCP-96 has Flow range: 0 - 27.5 U.S. GPM

According to Amazon spec sheet:


Most tankless require .4 GPM to start burner and .25 GPM to maintain burner
Rinnai does not show C85e-1 so you will have to consult your manual to see minimum water flow requirement.
Sample manual from Rainnai mentions 'minimum flow rate' several times but doesn't give specific number. Yet promotion blurb on page 1 says "Ultra operates at a lower minimum flow rate."
Another rinnai manual mentions flow rate several times in troubleshoot section yet fails to define what that rate is:

It might seem that tankless promoters...

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Looking for t he Best Tankless Water Heater?

Our team of experts have carefully picked the
best options out of hundreds of models!

The benchmarks of Best Tankless Water Heater lies on its capacity (GPM), dimension, efficiency factor, warranty and many other things. Tankless water heaters can be either gas fired or take electricity as a source of power. Generally gas fired tankless Water Heaters perform better and heats up water faster than electric tankless water Heaters. Best tankless water heaters have higher warranty periods and good after sales services. You do not want to stick with a company who never respond to your query or complaints. Added features like built in re-circulation pump, flow control valve, microprocessor technology take a tankless water heater to another level. Such devices pay a long way to eliminate the wait for hot water at beginning and balancing the flow rate with varied temperature. So let us have a look inside some market leading...

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Type of heater Saves energy Unlimited hot water? Easy to convert Water pressure Particulate in water Life Expectancy Can be integrated
with solar, geothermal, heat-pump or other energy source Temperature adjustment Whole house tankless electric

No savings

Can cost more.

Hard for electricity to heat water as water rushes past in pipe. See image

How to wire tankless electric

-Yes- When unit not undersized with optimal conditions

-Not consistant with saving energy or water

- No hot water in power outage


- Requires 90-120 Amps

- Typical home electric service is 150-200 Amps (check main breaker to see amps of your service)
- Upgrade service panel to convert to tankless electric.

-Homeowner install not recommended

1/2-3/4 gal per minute water flow before heater turns on

Low pressure causes tankless to shut off elements

High tech sensors will clog and fail in 2 years without softener
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Need a new

water heater

? To start your search, you need to decide between the two main water heater types:

Traditional water heaters Tankless water heaters

So, which one is better?

Well, that’s for you to decide. Like most purchases, there are trade offs. To make an educated decision, we’ve created this buyer’s guide to help you:

Understand the differences between tankless and traditional water heaters Learn the pros and cons of tankless and traditional water heaters

What’s the difference between a traditional and tankless water heater?

A Traditional water heater stores and preheats 30-50 gallons of water in a tank. That preheated water is used whenever someone showers, does the laundry or washes dishes. The tank then refills to be reheated once again.

Traditional tank water heater

A Tankless water heater uses a heat source (electric or gas) to warm up cool water on-demand whenever you need it rather than storing hot...

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Who hasn't experienced the aggravation of running out of hot water halfway through a shower? Maybe the in-laws are in town and using all of your hot water or perhaps you just have a conventional water heater that is about to die. Whatever the cause, a tankless water heater could be the solution you are looking for.The truth is that a tankless water heater actually works and is far superior to the old-fashioned gas or electric "tank" water heaters.

In a conventional water heater, be it gas or electric, hot water is stored in a tank. While this may keep a ready supply of hot water on hand for immediate use, the fact remains that the hot water just sits around when not being used. In time, the heat will dissipate and the water heater will need to reheat the water. This is a complete waste of energy and it is simply costing you money.

A tankless water heater, however, can not save hot water for later use. Instead, a tankless water heater only produces as much hot water as...

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Troubleshooting water heaters, common causes, symptoms and home repair guide for tank leaking, no hot water, not enough hot water, cold water sandwiches, sediments and scale build-up, noise, bad odor, gas valve problems, thermocouple replacement and other water heating issues.

Troubleshooting water heaters guide

What you need to know

Use this water heater repair guide to find out more about common causes and symptoms, how to identify problems and how to do repairs on tank type and tankless gas and electric water heating systems.

This guide can be used for repairing most of the water heaters sold in US and Canada including; Rheem, AO Smith, Bradford White, American, State, Kenmore, GE, Ruud, Whirlpool, Rinnai, Noritz, Takagi and other. Keep in mind that symptoms or signs of water heater failure among different manufacturers are very similar, if not the same, so directions for one brand and model can be applied to other.

To have a...

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Are you tired of paying money to constantly heat up water in a tank, just to run out of it every time Aunt Patricia is over for the holidays? Well, with a tankless water heater, not only will you benefit thanks to the endless supply of hot water, but you’ll also get to save precious space in your home from not having to deal with a bulky tank.

This is all thanks to the tankless water heaters design – which allows it to heat water “on-demand” as it passes through the unit’s heat exchanger. Compared to constantly heating water in a tank, this is a much more efficient way of doing things (around 25 – 35% more efficient to be exact).

This increase in efficiency will not only save you money on your utility bill, but will also help you do your part in taking care of the environment. However, in order to buy the best tankless water heater for your home – it’s important you know what to look out for; as there are a wide variety of different types and sizes you can choose...

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While they have higher efficiency, for most applications tankless water heaters don’t make sense.

Rheem's Prestige condensing tankless water heater has an efficiency of 94%, 11,000 to 199,000 Btu/hour gas input, a maximum hot water delivery (at a 45°F temperature rise) of 8.4 gpm, and a minimum flow rate of 0.26 gpm. Click to enlarge.Photo Credit: Rheem Water Heating

There are two primary types of water heaters: storage and tankless. In this column I’ll try to explain the differences between these two approaches and offer some guidance on choosing between them. (There are also “hybrid” water heaters with features of both that I’ll cover in a future blog post.)

Storage water heaters

Most water heaters are storage models. These are insulated tanks holding 20 to 120 gallons with either electric heating elements or gas burners. The storage tank stratifies with hot water at the top and cold incoming water at the bottom, so that as you draw off hot water (from the...

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Traditional water heaters are fickle friends in many ways. During heavy use, the 40- or 80-gallon reservoir can be emptied faster than it refills and heats, leaving someone in a cold shower. Heating and maintaining that much water at once isn’t very energy efficient, and if the heater suffers a catastrophic failure — that’s a lot of water pouring into your attic or garage.

While water heaters have been a staple in homes for decades, their inefficiencies have led to a new breed of home hot water systems — the tankless water heater. The tankless water heater is a mega-sized version of an electric tea kettle. There is no tank of standing water. Hot water is supplied through an element that heats the water just before it’s used by a cook who needs hot water for making the evening meal, or when it’s time for the kids to take a bath before bed.

At BestReviews, we take great pride in our thorough research and objectivity. To gain insight into the areas we cover, we perform...

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Though they are rare, power surges can occur at any time of the day or the night. They have the potential to damage or ruin any electrical device or appliance in your home. From your waffle iron to your curling iron, your television to your coffee maker, your stereo equipment to your computer. In addition, a power surge can also have the potential to ruin and damage your home utilities and HVAC system, including your hot water heater, boiler, furnace, and air conditioning unit. Power surges can cause a lot of costly damage in your home.

False Sense of Protection
Many homeowners falsely believe that either their homeowners insurance or HVAC warranty will protect them in the event of a power surge. However, most HVAC warranties do not cover damage or replacement in the event of a power surge. If you claim damage from a power surge on your homeowners insurance, you must prove that the damage occurred from the power surge.

What causes a power surge to happen?

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It wasn't trendy, funny, nor was it coined on Twitter, but we thought change told a real story about how our users defined 2010. Unlike in 2008, change was no longer a campaign slogan. But, the term still held a lot of weight. Here's an excerpt from our Word of the Year announcement in 2010:

The national debate can arguably be summarized by the question: In the past two years, has there been enough change? Has there been too much? Meanwhile, many Americans continue to face change in their homes, bank accounts and jobs. Only time will tell if the latest wave of change Americans voted for in the midterm elections will result in a negative or positive...

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