There’s a specific kind of sinking feeling every hot tub owner knows. You’ve been looking forward to a relaxing soak all day. You head out, flip the cover, and instead of the welcoming gurgle of heating jets, you’re greeted by a cold tub and a cryptic error code flashing on the control panel: “FLO,” “FL,” or “Flow Error.” Your heart drops. This single, simple error signifies a breakdown in the most critical conversation happening within your spa—the one between the water flow and the heater. Without proper flow, the heater element can dry-fire, overheat, and destroy itself in seconds, leading to a repair bill that can run into the hundreds. This is precisely the scenario the bonbo Hot Tub Heater Pressure Switch is designed to prevent. It’s not a glamorous component; it’s a small, unassuming sentry, but its job is arguably one of the most important in the entire system: to ensure the heater only ever activates when it’s safely submerged in moving water. When this tiny part fails, your entire hot tub experience grinds to a halt.
- Great Compatibility- 73995 Pressure Switch Fit for Watkins, for Caldera Vacanza, for Hot Spring HotSpot and Solana, except Sprint & Dash models. Model Years in 2006-current hot tub heaters. Improve...
- Safety Mechanism- The switch monitors the heater to turn on and off automatically based on water level. If in low flow condition (due to low water levels, blockage, or other issues), the switch will...
Key Considerations for Pool and Hot Tub Heating Components
A heating component, whether it’s a core part like a pressure switch or a full-scale heater, is more than just an item; it’s a key solution for extending the usability and enjoyment of your pool or spa. These devices are the heart of your system, responsible for transforming a chilly body of water into a luxurious, therapeutic oasis. Their main benefit is obvious—warm water on demand—but the underlying value lies in protecting the significant investment you’ve made in your hot tub or pool. A properly functioning heating system prevents catastrophic failures, ensures energy efficiency, and provides the reliable performance you expect. It’s the difference between a hot tub that’s always ready and one that’s a constant source of worry and unexpected costs.
The ideal customer for a replacement part like the bonbo Hot Tub Heater Pressure Switch is a hands-on hot tub owner who is comfortable with basic DIY repairs and has diagnosed a flow error down to a faulty switch. This is for the person who wants to save money on a technician call-out and get their spa running again quickly. It’s specifically for those with compatible Watkins, Caldera, Hot Spring Hotspot, or Solana models from 2006 onwards. Conversely, this part is not suitable for someone who owns a different brand of hot tub, a pre-2006 model, or a Sprint/Dash model. It’s also not for the person who is uncomfortable with any level of plumbing or electrical work, or whose heater issue is caused by something else, like a clogged filter or a failing circulation pump.
Before investing in any heating component, consider these crucial points in detail:
- Compatibility & Connection: This is non-negotiable. For a replacement part, you must verify the model number (73995 in this case), the brand and year range, and the physical connections. The bonbo switch uses a 1/8” MPT (Male Pipe Thread) and a specific 3-pin plug. Mismatching any of these will result in a part that simply won’t fit or function, wasting time and money.
- Function & Safety Protocol: Understand what the component does. A pressure switch is a safety device. It’s a “Normally Closed” switch, meaning it allows electricity to pass to the heater by default and only *opens* the circuit (cutting power) when it detects a lack of water pressure. This fail-safe is vital. Ensure the replacement part operates on the same principle as the original to maintain the integrity of your spa’s safety systems.
- Materials & Durability: The internal environment of a hot tub is harsh—a mix of high temperatures, constant moisture, and chemicals like chlorine or bromine. The bonbo switch uses copper for conductivity and robust plastic and rubber for insulation and sealing. Cheaper alternatives might use inferior materials that can corrode or crack prematurely, leading to another failure down the line.
- Ease of Use & Installation: For a DIY repair, simplicity is key. A component with a plug-and-play connector, like the 3-pin plug on this model, is vastly superior to one requiring wire splicing. Standardized threads like the 1/8″ MPT also ensure that you won’t need a host of specialized adapters. Consider the entire process from draining the tub to refilling and testing.
Choosing the right part isn’t just about fixing a problem; it’s about restoring peace of mind and ensuring your hot tub is a reliable source of relaxation, not frustration.
While the bonbo Hot Tub Heater Pressure Switch is an excellent choice for a specific repair, it’s always wise to see how it stacks up against the broader world of heating solutions. For a broader look at all the top models for different needs, we highly recommend checking out our complete, in-depth guide:
- Sold by Pool and Spa Centre - Official stockist of LX products
- 【Sturdy Build】Crafted from polished 304 stainless steel, this heat exchanger resists water damage and lasts long, making it perfect for chlorinated or saltwater pools and spas where corrosion is a...
Unboxing the bonbo 73995: A First Look at This Critical Component
Upon receiving the bonbo Hot Tub Heater Pressure Switch, our first impression was one of reassuring solidity. The component arrived in a simple, no-frills package, but the switch itself felt dense and well-constructed. Unlike some flimsy plastic parts that feel like they might crack under the pressure of a wrench, the bonbo switch has a substantial feel. The black plastic housing is thick, and the 1/8″ MPT threads are clean and precisely machined. We noted the use of a rubber gasket at the base of the threads, a small but critical detail for creating a watertight seal upon installation. The wiring leading to the 3-pin connector is properly insulated and feels securely attached to the main body. When we examined the 3-pin plug, it was a perfect match for the Watkins/Caldera system we were testing it on—a crucial detail that confirms its direct-fit claim. There were no signs of prior use, dirt, or damage, presenting as a brand-new, ready-to-install component. It’s a specialized part, but its build quality gives confidence that it’s designed to withstand the demanding environment of a hot tub’s heater tube.
Advantages
- Acts as a direct, OEM-quality replacement for a wide range of popular hot tub models.
- The 3-pin plug design makes for a simple, plug-and-play electrical connection, ideal for DIY repairs.
- Constructed from durable copper, plastic, and rubber to withstand heat and chemical exposure.
- Serves as an essential safety mechanism, protecting the expensive heater element from dry-firing.
Limitations
- Based on user feedback, there may be quality control issues with some units shipped (e.g., receiving used or damaged items).
- Compatibility is very specific, fitting only certain brands and years, and excluding models like Sprint and Dash.
A Deep Dive into the bonbo Hot Tub Heater Pressure Switch’s Performance
A pressure switch isn’t judged on flashy features, but on reliability, precision, and ease of installation. It’s a component that must work flawlessly in the background, day in and day out. We put the bonbo Hot Tub Heater Pressure Switch through its paces, focusing on the three areas that matter most to a hot tub owner: the installation process, its performance as a safety device, and its long-term durability prospects.
Installation Unlocked: A DIY-Friendly Fix for Your Hot Tub
The biggest hurdle for any DIY hot tub repair is accessibility and complexity. Fortunately, replacing a pressure switch on most compatible Hot Spring or Caldera models is remarkably straightforward, and the design of the bonbo Hot Tub Heater Pressure Switch makes it even easier. Our installation test began with the standard procedure: powering down the spa at the breaker, draining the water level below the heater assembly, and opening the equipment access panel. The old, faulty switch was located screwed directly into the stainless steel heater tube. Removal was simple, requiring just a wrench and a bit of care not to strip the old plastic housing.
This is where the bonbo switch truly shined. The 1/8″ MPT threads were a perfect match, screwing into the heater tube smoothly by hand before a final quarter-turn with the wrench to snug it up against the integrated rubber seal. There was no need for excessive Teflon tape or pipe dope, as the seal created a firm, watertight connection on its own. The most satisfying part of the installation was the electrical connection. The 3-pin plug is keyed, meaning it can only be inserted one way, eliminating any guesswork or the risk of incorrect wiring that could damage the control board. It clicked into place with a reassuring snap. From start to finish, the physical replacement of the switch took less than ten minutes. After refilling the tub, purging the air from the lines, and powering it back on, the dreaded “FLO” error was gone. The system primed, the circulation pump engaged, and the heater icon lit up. This seamless, plug-and-play experience is a massive benefit for any owner wanting to avoid a costly service call.
The Science of Safety: How the 73995 Protects Your Investment
To truly understand the value of this component, you have to appreciate the danger it mitigates. A hot tub heater element is like a super-powered version of the one in your kettle. It gets incredibly hot, incredibly fast. If it does this without water flowing over it to dissipate the heat, it will glow red-hot and burn out in under a minute, potentially melting the PVC plumbing around it. The bonbo pressure switch is the sentry that prevents this disaster. Its internal mechanism is a simple diaphragm that responds to the water pressure generated by the circulation pump. When the pump is running correctly and water is flowing, the pressure pushes on the diaphragm, which keeps an electrical circuit open, preventing power from reaching the heater if flow is inadequate (Note: in “Normally Closed” systems, it confirms adequate pressure to allow the circuit to remain closed and functional). If the pump fails, a filter gets clogged, or the water level drops too low, the pressure drops. The diaphragm relaxes, and the switch immediately cuts power to the heater circuit.
In our testing, we simulated these failure conditions. First, we intentionally restricted flow by closing a service valve partially. The bonbo Hot Tub Heater Pressure Switch responded instantly, and the heater indicator on the topside control went out. The moment we restored full flow, the switch re-engaged, and the heater kicked back on. We then powered the system down and back on quickly to try and “trick” it, but the switch logic held firm, only allowing the heater to engage after the pump had fully primed and established stable pressure. This isn’t just a feature; it’s the core purpose of the device. It performs this critical safety check constantly, providing the peace of mind that your expensive heater element and control board are protected from the most common cause of catastrophic failure. This reliable performance is a feature that really sets it apart as a trustworthy replacement part.
Built to Last? A Close Look at Materials and Durability
A replacement part is only as good as its lifespan. Installing a new switch only to have it fail again in six months is a frustrating and wasteful exercise. We closely examined the materials and construction of the bonbo Hot Tub Heater Pressure Switch to assess its potential for long-term durability. The main housing is made from a high-density, black thermoplastic. This choice is crucial, as it needs to resist the constant heat radiating from the heater tube as well as the corrosive effects of spa chemicals. It feels far less brittle than some older, OEM switches we’ve handled, which can become fragile over time.
Internally, the use of copper for the contacts and terminals is a significant plus. Copper offers excellent electrical conductivity and is more resistant to oxidation and corrosion than cheaper alloys. This ensures a reliable electrical signal is sent to the main board for years to come. The rubber components, including the main diaphragm and the o-ring seal at the threads, feel pliable and robust. In a hot tub environment, rubber can easily become hardened and cracked due to ozone and chemical exposure. While only time can truly tell, the quality of the materials used here suggests a design focused on longevity. The entire unit is well-sealed against moisture intrusion, a critical factor for any electronic component sitting in the humid, warm environment of a spa’s equipment bay. This attention to material science is what separates a reliable repair part from a temporary fix, and it’s clear that this switch is built to be the former.
What Other Users Are Saying
While our hands-on experience was overwhelmingly positive, it’s always important to consider the experiences of a wider range of buyers. The general sentiment for this type of specific replacement part tends to be very binary: it either works perfectly and solves the problem, or it doesn’t. In this case, the design and function are so specific that successful installation typically leads to a five-star outcome, restoring a multi-thousand-pound hot tub to full functionality for a fraction of the cost of a service call.
However, we did encounter some concerning feedback that’s worth noting. One user reported receiving an item that was “very clearly used. Open and muddy.” They were, quite rightly, unwilling to even attempt installation. This highlights a potential pitfall not with the product’s design, but with quality control or fulfillment from certain sellers. It serves as a crucial reminder for anyone buying parts online: always inspect the item immediately upon receipt. Ensure it is new, clean, and in its original packaging. While our test unit was pristine, this feedback underscores the importance of purchasing from a reputable source and being prepared to initiate a return if the product you receive is not in the condition you paid for.
bonbo Pressure Switch vs. The Competition: Repair Part or Full Heating Solution?
It’s important to frame this comparison correctly. The bonbo Hot Tub Heater Pressure Switch is a highly specific repair component for a built-in hot tub heater. The alternatives listed below are complete heating solutions, primarily for smaller, above-ground pools. They are not direct competitors, but rather represent different approaches to water heating in the wider aquatics category. If your sophisticated hot tub heater is down due to a faulty switch, the bonbo part is your solution. If you’re looking to add gentle heat to an Intex-style pool, then these alternatives come into play.
1. Intex Solar Heating Mat Pool
- Eco-friendly Solar technology.
- Increases pool temperature by 3-5 degrees
The Intex Solar Heating Mat is an entirely different beast. It’s a passive, eco-friendly solution designed to use the sun’s energy to warm pool water. It works by having your pool’s filter pump push water through the black mat’s channels, where it absorbs solar heat before returning to the pool. This is an excellent choice for an above-ground pool owner in a sunny climate looking to take the chill off the water without increasing their electricity bill. It is not, however, a solution for a hot tub. It lacks the power to heat water to therapeutic temperatures and is entirely dependent on sunshine, making it unreliable for on-demand heat. Someone would choose this over the bonbo switch if they don’t own a hot tub but want to add a bit of warmth to their summer paddling pool.
2. Intex Solar Heating Mat
- 1m x 1m surface to absorb sun's rays Dimensions before filling 1.20m x 1.20m.
- Includes 32mm hose attachment points and 2 B adapters for use with 38mm hoses
This is another version of the Intex Solar Heating Mat, specifying its suitability for pools up to 30,280 litres. Like the previous model, its strength lies in its simplicity and zero running cost. You can even link multiple mats together to increase the heating surface area for larger pools. It’s a fantastic, low-cost entry into pool heating for those with modest expectations. The trade-off is a lack of control; you can’t set a temperature, and its effectiveness is dictated by the weather. This is for the budget-conscious, environmentally-aware pool owner. It exists in a completely different universe from the bonbo pressure switch, which is a precision safety component for a high-power electric heater.
3. Intex Pool Heater
The Intex Pool Heater is the closest functional comparison, as it’s an active electric heater. However, it’s designed for smaller Intex and other above-ground pools, not for integrated spa systems. It typically connects in-line with the pool’s filter hose and provides a gentle temperature increase over several hours. While it offers more control than a solar mat, it lacks the raw power and sophisticated safety systems of a proper hot tub heater. An owner might choose this if they want to extend their swimming season in a small pool by a few weeks on either end. It is absolutely not a replacement for a Watkins or Caldera spa heater, and the bonbo pressure switch would have no place in its system.
The Final Word: Is the bonbo Hot Tub Heater Pressure Switch the Right Fix for You?
After a thorough analysis and hands-on testing, our verdict on the bonbo Hot Tub Heater Pressure Switch is overwhelmingly positive. This is a well-made, reliable, and perfectly compatible replacement part that does exactly what it promises: it resolves one of the most common and frustrating hot tub error codes with confidence. Its robust construction, featuring durable plastics and copper contacts, suggests a long service life, while the plug-and-play 3-pin connector and standard 1/8″ MPT make for a refreshingly simple DIY installation. It’s a small part that plays a giant role in the safety and functionality of your spa, and this model executes that role flawlessly.
We recommend the bonbo 73995 without hesitation to any owner of a compatible Watkins, Caldera, Hot Spring Hotspot, or Solana spa who is facing a “FLO” error and has diagnosed the issue down to the pressure switch. It offers a direct path to getting your hot tub back up and running, saving you from an expensive and potentially time-consuming professional service call. While it’s wise to be vigilant about the condition of the item upon arrival, the product itself is a top-tier solution. If you’re ready to banish that error code and get back to enjoying your hot tub, this is the part you need. You can check the latest price and secure one for your spa right now.
Last update on 2025-11-13 / Affiliate links / Images from Amazon Product Advertising API