
Dometic RV toilets are a popular choice for those seeking a comfortable and reliable sanitation solution when travelling. They offer a range of features, including gravity flush, macerating flush, and portable options, to cater to various space and water conservation needs. The electric flush models come with Normal and Low flush options, allowing users to control water consumption. This guide will explore the steps to flush Dometic electric RV toilets, including troubleshooting common issues, to ensure a seamless and comfortable experience for users.
| Characteristics | Values |
|---|---|
| Types | Gravity-flush, macerating, portable, cassette, composting |
| Gravity-flush types | Traditional, all-ceramic, foot-pedal-operated, high-profile, low-profile |
| Gravity-flush features | No electrical connection, consumes no energy, uses very little water, straightforward performance, installed above the black water tank |
| Macerating features | Motor-powered blades macerate waste, allows toilet and tank to be positioned apart |
| Portable features | Smaller than traditional toilets, can be used anywhere, some have their own water reservoir |
| Cassette features | 360-degree bowl-to-base rotation, limitless positioning options, some have their own water reservoir |
| Composting features | Requires composting material to break down solid waste, liquid waste stored in a different tank |
| Electric flush features | Normal and low flush options, full tank shut-down option, remote switch or electronic flush handle, high-profile |
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What You'll Learn

Choosing the right type of toilet for your RV
When it comes to choosing the right type of toilet for your RV, there are several factors to consider to ensure you get the best option for your needs. Firstly, let's look at the different types of RV toilets available:
Traditional RV Toilets
These are usually made of plastic, but porcelain options are also available. They are similar to residential toilets and typically use a foot pedal or a handle at the back to flush, causing waste to drop into a black tank below. Traditional RV toilets are best for those with Class B camper vans and pop-up campers.
RV Cassette Toilets
Cassette toilets are similar to traditional RV toilets in terms of function but tend to be smaller and have a 360-degree bowl-to-base rotation, making them ideal for extremely small spaces. They do not require an external holding tank, as waste is collected in a portable cassette.
RV Composting Toilets
Composting toilets are environmentally friendly and work by dropping liquid waste into a small tank while putting solid waste into a container of compost starter. The resulting compost can be used as fertilizer. They are a popular choice for those who want to save tank space while boondocking.
RV Incinerator Toilets
Incinerator toilets incinerate waste, leaving only ashes to dispose of. They eliminate the need for sewer hookups and water usage, but they are very expensive. Incinerator toilets are best suited for small RVs without bathrooms or for tent campers.
Gravity Flush Toilets
These toilets use gravity to drop bowl contents directly into a large holding tank. They are typically quiet and consume very little water. However, they may cause "mounding" inside the tank, making it difficult to rinse.
Macerating Flush Toilets
Macerating flush toilets use motor-powered blades to grind waste into a slurry before it goes into a holding tank. This allows the toilet and tank to be positioned apart from each other. Macerating flush toilets are easier to discharge and reduce the risk of blockages caused by toilet paper.
When choosing an RV toilet, consider the size and layout of your bathroom, as well as your budget and personal preferences. Some key factors to keep in mind are the flushing mechanism, ease of cleaning, durability, water usage, and additional features such as bidet attachments or slow-close seats. It is also important to measure the area and consider the type of installation required before making your purchase.
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How to change flush modes
The Dometic 8700 series MasterFlush toilets offer two flush settings to help manage water consumption: Normal Flush and Dry Bowl Flush. The Normal Flush uses 0.85 gallons (3.2 litres) per flush and adds water to the bowl after every flush. The Dry Bowl Flush uses 0.45 gallons (1.7 litres) per flush and does not add water to the bowl after flushing.
To change from Normal to Dry Bowl flush setting, press the "Flush" switch for about five seconds. When the ""Power On" light starts flashing, release the "Flush" switch. Your flush mode has now been changed to the Dry Bowl setting.
To change back to the Normal Flush mode, hold the flush button for approximately 3-5 seconds. The power button should begin to flash. Your next flush should be a normal water flow.
If you are away from sources of water or electrical power for long periods, it is recommended to have a pedal flush gravity toilet. These toilets allow the user to be in complete control of water consumption, using as little water as possible and extending the time between emptying the waste tank.
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How to replace a flush valve
To replace a flush valve on a Dometic electric RV toilet, follow these steps:
First, identify the model of your Dometic toilet. This is important as different models may have slightly different procedures for replacing the flush valve. You can find the model number on the toilet or in the product manual. Once you have the model number, you can refer to the manufacturer's instructions or a repair guide specific to your model.
Next, gather the necessary tools and parts. For this repair, you will likely need a replacement flush valve, which you can purchase online or from an RV parts supplier. Common Dometic replacement flush valves include the DOM93FR and the 385311641 Water Valve Kit. In addition, basic tools such as screwdrivers and wrenches may be needed, depending on your toilet model.
Now, turn off the water supply to the toilet. This is usually done by closing the valve that connects the freshwater supply to the toilet. You may also want to drain the toilet tank to reduce the chance of spills during the repair.
Then, carefully remove the old flush valve. This typically involves unscrewing or detaching any screws, clamps, or connectors holding the valve in place. Be gentle to avoid damaging other components, and pay attention to how the valve is attached so you can install the new one correctly.
After that, install the new flush valve. Position the new valve in the same way as the old one, securing it with the appropriate screws or connectors. Ensure that all connections are tight to prevent leaks.
Finally, turn on the water supply and test the flush. Check for any leaks around the new valve and ensure that the toilet is functioning properly. Adjust as necessary and refer to your product manual for additional troubleshooting tips.
Remember to consult the specific instructions for your Dometic model, as there may be slight variations in the flush valve replacement procedure.
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The benefits of a gravity-flush toilet
Electric RV toilets, such as the Dometic 8700 series, offer "Normal" and "Low" flush options to help control water use. However, gravity-flush toilets have several benefits that make them a popular choice for RV owners.
Firstly, gravity-flush toilets consume very little water because they do not require additional water to flush waste from the bowl. This is particularly advantageous when off-grid camping or when trying to conserve water and tank capacity. The absence of a motor in cassette, portable and pedal-flush gravity toilets also means they are very quiet, which can be beneficial in an RV setting. Gravity-flush toilets are also simple to operate and reliable, as they use the force of gravity to move water and waste out of the bowl, ensuring a straightforward performance. This simplicity also means they are easy to repair and maintain, with inexpensive parts and little tools required.
Another benefit of gravity-flush toilets is that they can be installed in bathrooms with limited space and unusual layouts. Unlike macerating flush toilets, gravity-flush toilets do not require a motor, so the toilet and waste holding tank are positioned together, directly over the waste tank. This means they can fit in tight spaces and do not need to be installed on raised platforms.
Finally, gravity-flush toilets provide users with complete control over water consumption. This is particularly useful when away from sources of water or electrical power for long periods, as it extends the time between emptying the waste tank.
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How to avoid overfilling the holding tank
To avoid overfilling the holding tank in your Dometic electric RV toilet, you can take several precautions. Firstly, be mindful of what you flush down the toilet. Avoid disposing of non-biodegradable items, foreign objects, or excessive amounts of toilet paper. Use toilet paper sparingly and opt for RV-specific or biodegradable varieties, as these dissolve quickly and reduce the risk of clogs. Additionally, consider using alternative waste disposal methods, such as disposable liners or wipes.
It is also important to regularly inspect your RV toilet and plumbing system for any signs of leaks, damage, or blockages. Address minor issues promptly to prevent them from becoming more significant problems. Familiarize yourself with your RV's toilet system and its components, including the flushing mechanism and water supply. Consult the manufacturer's instructions if you notice any inconsistencies in water levels or toilet performance.
Another way to avoid overfilling is to ensure proper waste disposal. Empty the holding tank regularly and consider using a tank deodorant before emptying to minimize odours. If you have a macerator toilet, its motor-powered blades will macerate waste into a viscous slurry, making it easier to discharge from the holding tank.
Finally, some electric flush switches include a "full tank" shut-down option. This feature cuts off power to the toilet when the tank is full, preventing overfilling. If your RV toilet system does not have this feature, consider upgrading to a model with a full tank shut-down option for added reassurance.
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Frequently asked questions
The type of toilet you choose depends on the size of your restroom and the number of people using it. If you have a small RV with a compact restroom, opt for a smaller toilet with a removable tank. If your restroom has limited space, a cassette toilet with 360-degree bowl-to-base rotation can be a good option.
There are several flushing mechanisms available for RV toilets, including gravity flush, macerating flush, and electric flush. Gravity flush toilets are the most traditional and use a foot pedal for flushing. Macerating flush toilets use motor-powered blades to macerate waste before it goes into the holding tank. Electric flush toilets offer \"Normal\" and \"Low\" flush options and often include a \"full tank\" shut-down feature.
Electric flush toilets offer more control over water use with "Normal" and "Low" flush options. They also often include a \"full tank\" shut-down feature that cuts off power to the toilet to avoid overfilling the holding tank, reducing the risk of damage. Electric flush toilets are also easier to use for individuals with mobility concerns.
To change the flush settings on your Dometic electric RV toilet, hold the flush button for approximately 3-5 seconds. The power button should start flashing, indicating that you have changed to the full flush mode. Your next flush should be a normal water flow.
It is important to regularly inspect and replace parts such as the flush valve and the ball valve seal to prevent leaks and conserve water. Additionally, consider upgrading to features such as hand sprayers for bowl rinsing and slow-closing seats for added comfort and convenience. If your toilet is not flushing, it could be due to a power issue or a problem with the sensor.











































