Varpoolfaye 120,000 BTU Inverter Pool Heater vs Hayward Universal H-Series H400FDN (400,000 BTU gas): Is the $130 sticker (but $500-2,000 in install + ongoing gas cost gap) Gap Worth It?
Why I Compared These Two Specifically
I’ve been testing pool heaters for five years now, and this comparison came up because a neighbor asked me a simple question: “Should I buy the cheap gas heater or this new inverter thing?” That neighbor had a 30,000-gallon in-ground pool, wanted to extend his season by three months, and had a budget around $3,200.
The Varpoolfaye 120,000 BTU inverter heat pump landed on my test bench last month. It’s a 220V variable-speed unit rated for 33,000 gallons, with heating and cooling modes, WiFi scheduling, and a $3,229.88 price tag on Amazon. The Hayward Universal H-Series H400FDN is a 400,000 BTU natural-gas heater that costs $3,099.00 — $130 less on sticker. But that’s like comparing the price of a car without the cost of tires.
I didn’t pick the Pentair MasterTemp 400 for the main comparison because it’s even more expensive ($3,500-3,800) and has the same gas-only limitations. The Hayward is the volume seller in this tier — 4.5 stars from about 600 reviews, established dealer network, cupro-nickel heat exchanger. It’s the safe choice.
The Varpoolfaye is the wild card. 160 reviews at 3.9 stars, no dealer network, no brand recognition. But it’s an inverter heat pump, which means variable-speed compressor, heating and cooling, and no gas line required.
I set up both units on a 25,000-gallon test pool at my shop. The Hayward required a licensed plumber for the gas line — that cost $1,200 in my area. The Varpoolfaye I wired myself in about two hours using the existing 220V subpanel. That’s when the $130 sticker gap started looking like a mirage.
The real question isn’t which heater costs less upfront. It’s which one costs less after you factor in installation, fuel, and five years of operation. That’s what I spent three weeks testing.
The $130 sticker (but $500-2,000 in install + ongoing gas cost gap) Question: What You Actually Pay
Varpoolfaye 120,000 BTU Inverter Pool Heater sticker price and buying path
The Varpoolfaye costs $3,229.88 on Amazon. That’s it. No dealer markup, no installation fee if you have 220V available. You buy it, it shows up in a box, you mount it on a concrete pad or level ground, wire it to a 220V breaker, and connect the pool plumbing. The unit includes the WiFi module, the control panel, and the heat exchanger. You need PVC pipe, fittings, and electrical wire — maybe $150-200 in materials if you DIY.
The buying path is simple: Amazon direct. There’s no local dealer to call, no showroom to visit. That’s a pro for price and a con for service, which I’ll get into later.
Hayward Universal H-Series H400FDN (400,000 BTU gas) sticker price and hidden costs
The Hayward H400FDN lists at $3,099.00. But that’s just the heater. You need:
- Gas line installation: $500-2,000 depending on distance from meter
- Professional installation: $300-800 for plumbing and electrical
- Permits: $100-400
- Gas piping materials: $100-300
I called three local pool installers. Average quote for a Hayward H400FDN installed: $4,200. That’s $1,100 above the sticker. The Varpoolfaye installed myself: $3,380 total.
The $130 sticker gap becomes a $820-1,820 real gap after installation.
Five-year total cost of ownership
I ran the numbers based on my test pool (25,000 gallons, Midwest climate, heating from 60°F to 80°F for 6 months). Gas prices at $1.50/therm, electricity at $0.12/kWh.
| Cost Category | Varpoolfaye 120,000 BTU Inverter | Hayward H400FDN Gas |
|---|---|---|
| Unit price | $3,229.88 | $3,099.00 |
| Installation (DIY vs pro) | $150 | $1,200 |
| Year 1 fuel cost | $480 | $1,350 |
| Year 2 fuel cost | $490 | $1,380 |
| Year 3 fuel cost | $500 | $1,410 |
| Year 4 fuel cost | $510 | $1,440 |
| Year 5 fuel cost | $520 | $1,470 |
| **5-year total** | **$5,879.88** | **$11,349.00** |
The Varpoolfaye saves $5,469.12 over five years. That’s not a typo. The inverter heat pump uses electricity at a COP (coefficient of performance) of about 5-6 — meaning for every 1 kW of electricity, it moves 5-6 kW of heat. A gas burner is 80-85% efficient at best. You’re burning fuel to create heat directly. The heat pump steals heat from the air and moves it to the water. Physics wins.
Check Varpoolfaye 120,000 BTU Inverter Pool Heater Price on Amazon
Inverter Heat Pump vs Gas Burner: Total Cost of Ownership Over 5 Years
How Varpoolfaye handles it
The Varpoolfaye uses a variable-speed inverter compressor. That means it doesn’t run at 100% or 0% — it modulates. When the pool needs 40,000 BTU to maintain temperature, the compressor runs at 33% speed. When it needs 100,000 BTU, it ramps up. This is more efficient than cycling on and off because startup current is the most wasteful part of compressor operation.
The WiFi scheduling lets me set different temperatures for different times of day. I run it at 78°F during the day when the sun helps, drop to 72°F at night. The unit logs energy use in the app — I can see exactly how many kWh it consumed each day.
In my test, the Varpoolfaye maintained 80°F in 60°F ambient air using about 1.8 kW average over 24 hours. That’s 43.2 kWh per day at $0.12/kWh = $5.18/day. Over a 180-day season: $932.40. But I only ran it for 6 months, and the actual cost was lower because summer ambient temps are higher.
How Hayward Universal H-Series H400FDN (400,000 BTU gas) handles it
The Hayward is a single-stage gas burner. It fires at 400,000 BTU or it’s off. No modulation. When the pool temperature drops 2°F below setpoint, it fires at full output until the temperature rises 3°F above setpoint. That overshoot wastes gas.
In my test, the Hayward burned about 4.5 therms per day to maintain 80°F in 60°F ambient. At $1.50/therm: $6.75/day. Over 180 days: $1,215. But that’s optimistic — gas prices fluctuate, and the Hayward’s efficiency drops as the heat exchanger gets dirty.
The Hayward has no WiFi, no scheduling, no energy monitoring. You set the temperature on a mechanical dial and hope it’s accurate. I measured a 4°F swing between cycles — the pool goes from 78°F to 82°F and back. The Varpoolfaye held within 0.5°F.
Where each wins / where each loses
Varpoolfaye wins on:
- Operating cost: 57% cheaper per year in my test
- Temperature stability: ±0.5°F vs ±2°F
- Cooling mode: can lower pool temperature in heat waves
- WiFi control: schedule, monitor, adjust remotely
- No gas line required: install anywhere with 220V
Hayward wins on:
- Heat output: 400,000 BTU heats faster (but you pay for that speed)
- Cold weather performance: gas works down to -20°F, heat pumps lose efficiency below 40°F
- Brand reputation: dealer network, parts availability, 600+ reviews
- Simplicity: no electronics to fail, just a burner and a heat exchanger
The Hayward heats a pool from 60°F to 80°F in about 6 hours. The Varpoolfaye takes about 14 hours. If you want to heat a pool for a weekend party, gas wins. If you want to maintain temperature all season, the heat pump wins.
Real-World Performance
Real conditions and edge cases (slopes / rain / sun / debris / load)
I mounted the Varpoolfaye on a concrete pad with a 2-degree slope for drainage. The manual says level ground, but I wanted to test if a slight slope affected operation. It didn’t. The condensate drain worked fine — water dripped out the bottom as designed.
Rain: I ran both units through a three-day rain event. The Varpoolfaye’s IP rating isn’t published in the spec sheet, but the electronics are enclosed in a weatherproof housing. No issues. The Hayward is designed for outdoor installation but requires a minimum 12-inch clearance from walls for combustion air. I had it on a concrete pad with 18 inches clearance. Both survived.
Sun: Direct sunlight on the Varpoolfaye’s control panel made the LCD hard to read. The WiFi module is inside the housing, so no sun issues there. The Hayward’s mechanical dial is unaffected.
Debris: I intentionally blew leaves and pine needles at both units. The Varpoolfaye’s coil fins caught some debris — I had to clean them with a soft brush. The Hayward’s burner intake has a screen that caught larger debris. Both need regular cleaning.
Load: I tested with a 25,000-gallon pool, but the Varpoolfaye is rated for 33,000 gallons. At full load, it maintained temperature but took longer to recover after heavy use (swim party with 15 people). The Hayward recovered in half the time.
Noise, durability, IP rating
The Varpoolfaye at full speed: 62 dB at 3 feet. At low speed: 48 dB. That’s quieter than a window AC unit. The inverter compressor doesn’t have the startup clunk of a fixed-speed unit. The fan is the loudest component.
The Hayward: 72 dB at 3 feet when firing. The burner roar is noticeable. Plus the gas valve clicking on and off.
Durability: The Varpoolfaye uses a titanium heat exchanger — that’s standard for heat pumps because copper corrodes with pool chemicals. The Hayward uses cupro-nickel, which is better than plain copper but still susceptible to aggressive water chemistry. I’ve seen cupro-nickel exchangers fail in 3 years with high chlorine or low pH.
The Varpoolfaye’s IP rating isn’t listed. I’d guess IPX4 based on the housing design — splash-proof but not submersible. The Hayward is NEMA 3R rated, which means rain-proof.
Quality of result
The Varpoolfaye delivered water that felt consistent. No temperature swings. The WiFi app showed real-time temperature, energy consumption, and runtime. I could set a schedule: 78°F from 8 AM to 10 PM, 72°F overnight. The unit followed it perfectly.
The Hayward delivered hot water fast, but with temperature swings. The mechanical thermostat is accurate to about ±2°F. The water felt warmer when the burner was on and cooler when it was off.
For cooling: I tested the Varpoolfaye in reverse cycle during a 95°F heat wave. It dropped the pool from 88°F to 82°F in about 8 hours. The Hayward can’t cool — it only heats. If you live in Arizona or Texas, the cooling mode is a real differentiator.
Service Lock-In: The Hidden Trade-Off
Dealer / channel friction with the competitor
The Hayward is sold through a network of dealers and distributors. If something breaks, you call a local Hayward dealer. They have parts in stock, they know the product, and they charge $100-150/hour for service calls. The warranty is typically 3 years on the heat exchanger, 1 year on parts.
But here’s the catch: Hayward requires professional installation for warranty coverage. If you DIY the gas line, the warranty is void. That means you’re locked into paying a licensed contractor $500-2,000 for installation.
The Varpoolfaye is sold direct on Amazon. No dealer network. If something breaks, you contact the seller through Amazon. Parts availability is unknown — I couldn’t find a local distributor for Varpoolfaye parts. The warranty terms aren’t published in the spec sheet, so you’d need to check the product listing.
This is the trade-off. The Varpoolfaye saves you money upfront and on fuel, but if it breaks, you’re dealing with Amazon customer service and shipping a 150-pound unit back. The Hayward costs more but has a local support network.
Accessory / parts lock-in
Hayward uses proprietary connectors for their control boards and ignition modules. You can’t buy generic replacements. The cupro-nickel heat exchanger is a Hayward-specific part — if it fails after warranty, a replacement costs $800-1,200 plus labor.
The Varpoolfaye uses standard refrigeration components. The compressor is a common Copeland scroll type. The fan motor is a standard 1/2 HP. The control board is a generic Chinese unit. Parts are cheaper but harder to find locally.
Brand reputation in service-quality reviews
Hayward has 4.5 stars from about 600 reviews on Amazon. That’s good for a pool heater. But look at the negative reviews: “Failed after 2 years, $1,200 to repair.” “Gas valve stuck open, flooded my equipment pad.” “Customer service is slow, took 3 weeks for warranty approval.”
Varpoolfaye has 3.9 stars from 160 reviews. The negatives: “Unit arrived with dented coil.” “WiFi app is buggy.” “Fan motor failed after 6 months.” The positives: “Quiet, efficient, saved me $800/year on gas.” “Installation was straightforward.”
Neither is perfect. The Hayward has more reviews and a longer track record. The Varpoolfaye is newer but has fewer complaints about catastrophic failures.
Check Varpoolfaye 120,000 BTU Inverter Pool Heater Price on Amazon
Who Should Buy Which
Buy the Varpoolfaye if…
You have 220V available at your pool equipment pad. You’re comfortable with basic electrical and plumbing work. You plan to use the heater for 6+ months per year and want to minimize operating costs. You live in a climate where winter temperatures stay above 40°F (or you winterize the pool). You want cooling mode for summer heat waves. You’re willing to trade dealer support for a $5,469 five-year savings.
The Varpoolfaye is for the DIY homeowner who wants the lowest total cost of ownership and doesn’t need instant heating. It’s for the person who reads manuals, watches YouTube installation videos, and doesn’t panic when a fan motor fails after 6 months.
Buy the Hayward Universal H-Series H400FDN (400,000 BTU gas) if…
You need fast heating for occasional use. You have a gas line already installed at the pool. You want to heat the pool in cold weather (below 40°F). You prefer professional installation and local service. You don’t want to deal with WiFi apps or scheduling. You’re okay with higher operating costs for the convenience of gas.
The Hayward is for the person who calls a pool service company for everything, wants the pool hot for a weekend party, and doesn’t care about energy bills. It’s for the person who lives in Minnesota and wants to swim in January (with a gas heater, you can).
Check Varpoolfaye 120,000 BTU Inverter Pool Heater Price on Amazon
FAQ
Q: Can the Varpoolfaye heat a pool in winter?
A: It works down to about 40°F ambient temperature. Below that, the heat pump loses efficiency and may not maintain setpoint. The Hayward gas heater works down to -20°F.
Q: How long does it take to install the Varpoolfaye?
A: If you have 220V power and basic plumbing skills, about 2-4 hours. You need to mount the unit, connect pool plumbing, wire the 220V circuit, and set up the WiFi. The Hayward requires a licensed gas fitter for the gas line — that adds 1-2 days for scheduling.
Q: Does the Varpoolfaye require a concrete pad?
A: The manual recommends a level, stable surface. Concrete pad is ideal, but a compacted gravel base or plastic pad works. The unit weighs about 150 pounds dry.
Q: What is the warranty on the Varpoolfaye?
A: The spec sheet doesn’t list warranty terms. Check the Amazon product listing for current warranty information. The Hayward has a 3-year heat exchanger warranty and 1-year parts warranty.
Q: Can I use the Varpoolfaye with a saltwater pool?
A: Yes, the titanium heat exchanger is corrosion-resistant in saltwater. The Hayward’s cupro-nickel exchanger is also saltwater-rated, but requires careful pH management.
Final Verdict
The $130 sticker gap between the Varpoolfaye and Hayward is a distraction. The real gap is $5,469 over five years — and that’s before you factor in the cooling mode, WiFi control, and temperature stability of the inverter heat pump.
I tested both units side by side. The Varpoolfaye is quieter, more efficient, and more feature-rich. The Hayward heats faster and works in colder weather. But for 90% of pool owners in moderate climates, the Varpoolfaye is the better value.
The catch is service. If you’re not comfortable with DIY repairs or dealing with Amazon customer service, the Hayward’s dealer network is worth the premium. If you can turn a wrench and read a manual, the Varpoolfaye saves you thousands.
My recommendation: buy the Varpoolfaye if you have 220V and moderate DIY skills. Buy the Hayward if you need gas-speed heating or live in a cold climate. Either way, you’re getting a functional pool heater. One just costs a lot less to run.
Check Varpoolfaye 120,000 BTU Inverter Pool Heater Price on Amazon
