--- product_id: 79632017 title: "KOLERFLO 3/4 Inch Hot Water Circulating Pump 3-Speed Circulation Water Pump for Solar Heater System(RS15-6 Red)" brand: "kolerflo" price: "£60.90" currency: GBP in_stock: true reviews_count: 13 url: https://www.desertcart.co.uk/products/79632017-kolerflo-3-4-inch-hot-water-circulating-pump-3-speed store_origin: GB region: United Kingdom --- # 93/67/46W 3-speed power 36/29/20 LPM flow rate 3/4 inch NPT inlet/outlet KOLERFLO 3/4 Inch Hot Water Circulating Pump 3-Speed Circulation Water Pump for Solar Heater System(RS15-6 Red) **Brand:** kolerflo **Price:** £60.90 **Availability:** ✅ In Stock ## Summary > 🔥 Pump up your comfort with instant hot water! ## Quick Answers - **What is this?** KOLERFLO 3/4 Inch Hot Water Circulating Pump 3-Speed Circulation Water Pump for Solar Heater System(RS15-6 Red) by kolerflo - **How much does it cost?** £60.90 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/79632017-kolerflo-3-4-inch-hot-water-circulating-pump-3-speed) ## Best For - kolerflo enthusiasts ## Why This Product - Trusted kolerflo brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Last:** Durable aluminum housing & corrosion-resistant PES impeller ensure long-term reliability. - • **Silent & Eco-Friendly:** Super quiet operation with low power consumption—perfect for sustainable living. - • **Triple-Speed Efficiency:** Customize flow with 3-speed control for optimal energy use and performance. - • **DIY-Friendly Installation:** Easy wrench-only setup saves plumber costs and hassle—upgrade your home effortlessly. - • **Instant Hot Water, Zero Wait:** Get hot water in just 15 seconds—no more wasting time or water. ## Overview The KOLERFLO RS15-6 is a robust 3/4 inch hot water circulating pump featuring a 3-speed control system with power ratings of 93, 67, and 46 watts. It delivers a high flow rate up to 36 LPM and withstands pressures up to 145 psi, making it ideal for solar heater systems and residential hot water circulation. Its corrosion-resistant components and aluminum housing ensure durability, while its quiet, energy-efficient operation reduces water waste and energy costs. Designed for easy installation, it’s a smart upgrade for modern homes seeking instant hot water and winter pipe protection. ## Description As a China-based brand specializing in home water pressurization appliances. KolerFlo committed to creating quality products and responsive service to satisfy our customers.Provide our users with more and more considerate products. From 2017, we start our business in home water pumps category. We are a new brand but quickly become a professional water pump market leader. Stable performance,wide range of applications,high-quality, and innovation makes our products unique. We is committed to advocate the concept of healthy life style, and hope our products helps more and more people. The circulator pump features a susceptible built-in electronic sensor. The pump will start up automatically when there is water flow. Power ranges from 46W to 93W. More convenient efficient to use the pump. Our recirculating pump is equipped with a cast iron head, aluminum housing, PES impeller, brass fittings, and a water stop. Rust-proof, waterproof, and corrosion-proof for years of use. Powerful flow with 5.28/7.66/9.5 GPM and the head lift can reach 13/16/20 ft. The maximum pressure of this water circulator pump is 10 Bar(145Psi). High efficient and large flow but low energy consumption. ## Features - Rated power: 93/67/46 W. NPT 3/4 inch (19.05 mm) inlet/outlet. Voltage/Frequency: 110-120V, 60Hz. Max pressure: 145 psi (10 bar),the circulation pump with three-speed control. Flow: 36/29/20 LPM (9.5/7.66/5.28 GPM). Max head: 6/4.9/4 m (20/16/13 ft);Pump housing: Aluminum. Impeller: Corrosion-resistant, composite, PES. Shaft: 45 # steel. Bearing: Carbon axia. - Easy installation, only need a wrench to connect the pump to the pipeline, saving you the cost of plumbers; Instant hot water, waiting for 2-3 minutes in the past, now it takes only 15 seconds to get hot water. - Prevent pipes from freezing in winter, especially for cold winter areas. In addition, if your pipes pass through the floor, the floor will also become warm. - The circulation water pump features high efficiency with low consumption. High temperature resistance, anti-fraying, high flow and leak-tightness. Super silent, environmental friendly,saving energy, running power, reducing the waste of cold water and waiting time, suitable for water scarce areas, such as desert areas. - KOLERFLO circulation water pump RS15-6 Used in Suitable for city buildings, suburban villas, houses, water and pressurized with industrial equipment, air conditioning, boilers, solar circulating water, hot water circulating warm and so on. ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B07D54THTT | | Best Sellers Rank | #92,716 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #88 in Power Water Pumps | | Brand Name | KolerFlo | | Color | Rs15-6 Red | | Customer Reviews | 4.0 4.0 out of 5 stars (680) 4.0 out of 5 stars | | Flow Rate | 13 Gallons Per Minute | | Horsepower | 0.13 Horsepower | | Item Dimensions L X W X H | 5.12"L x 5.12"W x 4.92"H | | Item Weight | 4.6 Pounds | | Manufacturer | KOLERFLO | | Manufacturer Part Number | KF204 | | Material Type | Aluminum, Corrosion-resistant composite (PES), 45 # steel, Carbon axial bearing | | Maximum Lifting Height | 952 Meters | | Model Number | KF204 | | Power Source | Solar Powered | | Product Style | Above Ground | | Unit Count | 1.0 Count | | Upc | 652054530936 | | Voltage | 110 Volts | ## Product Details - **Brand:** KolerFlo - **Color:** Rs15-6 Red - **Item Weight:** 4.6 Pounds - **Material:** Aluminum, Corrosion-resistant composite (PES), 45 # steel, Carbon axial bearing - **Maximum Flow Rate:** 13 Gallons Per Minute - **Maximum Lifting Height:** 952 Meters - **Power Source:** Solar Powered - **Product Dimensions:** 5.12"L x 5.12"W x 4.92"H - **Style:** Above Ground - **Voltage:** 110 Volts ## Images ![KOLERFLO 3/4 Inch Hot Water Circulating Pump 3-Speed Circulation Water Pump for Solar Heater System(RS15-6 Red) - Image 1](https://m.media-amazon.com/images/I/71lK8DBTMSL.jpg) ![KOLERFLO 3/4 Inch Hot Water Circulating Pump 3-Speed Circulation Water Pump for Solar Heater System(RS15-6 Red) - Image 2](https://m.media-amazon.com/images/I/71oxijtePQL.jpg) ![KOLERFLO 3/4 Inch Hot Water Circulating Pump 3-Speed Circulation Water Pump for Solar Heater System(RS15-6 Red) - Image 3](https://m.media-amazon.com/images/I/71V1Z+ZQ5wL.jpg) ![KOLERFLO 3/4 Inch Hot Water Circulating Pump 3-Speed Circulation Water Pump for Solar Heater System(RS15-6 Red) - Image 4](https://m.media-amazon.com/images/I/71Hq7Yh3dLL.jpg) ![KOLERFLO 3/4 Inch Hot Water Circulating Pump 3-Speed Circulation Water Pump for Solar Heater System(RS15-6 Red) - Image 5](https://m.media-amazon.com/images/I/71xhSMeiQYL.jpg) ## Available Options This product comes in different **Color** options. ## Questions & Answers **Q: Is the RS15-6 Green okay for potable water systems?** A: You'd better try RS15-6 SS Green for potable water system. **Q: Can this recirculate cold water instead of hot water? If i want to use it that way?** A: The question of hot water vs cold water pumps is a question about motor cooling. As a general idea, all hot water pumps can pump cold water regardless of manufacturer. This doesn’t hold for cryogenics though. TLDR - yes you can. **Q: how is it on electrical consumption?** A: The info that came with it says 46 watts at the lowest (of 3) speed settings which is what I use. That's 81 kWh per year, pretty small. the highest speed setting uses 93 watts. I don't notice it on my electric bill but then I have a 3200 SF house (4 bdrm colonial) with air condition in the Northeast. It works great. I used to have cold water and have to wait 1 minute wide open running time to get hot water; now it's instantly warm and hot within 20 seconds. Also, you can put it on a time (or buy one with the timer installed) but I get up often in the middle of the night and like instant warm/hot water. **Q: Are there instructions /operating manual available written in English?** A: Nope! It is cartoon drawn images for instructions. Not much to it. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Best pump for the price value *by on Reviewed in the United States June 23, 2023* I installed this recirculating pump in parallel with smart Valve on my Tankless water heater to get hot water instantly by recirculating all cold water in hot water line. It feels great to have hot water instantly when you turn the tap during winter mornings. I save around 5 gallons of water every time I need hot water and this very much required in every home in So Cal where we have drought all the time.I installed recirculating pump at the hot water outlet on tankless water connected to a smart plug and at the far end of the house I used this smart value (https://www.amazon.com/gp/product/B08Q364CCZ) to connect the hot water and cold water line. When I instruct my google home to turn on the pump it will turn on the recirculating pump which in turn will open the smart valve. There is a timer which turns off the pump after 3 mins, which will in turn shut the smart valve. Initially I placed a Grundfos 595926 Valve in place of the smart value but its working intermittently and not perfectly.This recirculating pump and smart valve is a great addition and its running with no issues for last 4 months. We turn this system 5 to 6 times every day. I strongly recommend buying a Midline Valve EVGG0034-OM Dielectric Union Pipe Fitting (https://www.amazon.com/gp/product/B08L5QTHN2) which saved a lot of time with installation. ### ⭐⭐⭐⭐⭐ Works Great *by on Reviewed in the United States September 23, 2020* Update: I've had this for 4 years now and still running great.Original review: I got this to circulate water from my hot water heater to the far fixtures in my house for instant hot water. It works great. Other reviewers posted issues with the pump because they couldn't stop the leaks from the connections. With a lot of plumbing experience, I figured that I was smart enough to overcome those issues. First thing to realize it that the threads are hose threads, not pipe threads so a straight pipe connection would not work. I first purchased an adapter with hose threads thinking that I had quickly whipped the problem - wrong, it leaked bad. I don't know if it was the weak threads or the adapter was warped, but after multiple tries I could not get it to stop leaking. So much for my superior experience. Next I tried a braided hose designed for water heater connections. That worked! The problem with this approach is how to support the pump because the hose will not. I got a long hose, 24", long enough to loop without kinking, and looped it so that the pump rested on top of the water heater. I used the styrofoam packing to cradle it and just let it rest on the water heater and completed the connection to the water supply with another braided line. No problems. I made a timer with a light switch timer linked to an outlet. That also works like a charm at less than $30. See photos. I am considering, however, getting a smart outlet so that I can turn on the pump with an app just when hot water is needed as another reviewer mentioned. ### ⭐ Rust on non-stainless version, adapters missing, tankless OK (with caveats)! *by on Reviewed in the United States April 7, 2021* TLDR: The non-stainless version WILL rust; try different versions (and different "brands") of this pump if yours doesn't seem to pump enough water; ensure your pump comes with the pipe fitting adapters (that have o-rings) because the threads are NOT true NPT-fit threads and will leak; instructions are a joke so read enough reviews/do your own research to make sure you know how to install this (it's not complicated but the instructions make you question your own intelligence); no "on/off" switch so plan to use with a switched outlet or smart outlet for control.This review is for the unit I bought (RS15-6 Blue). I intended to use it with the Grundfos-made thermal bypass valve for creating a water recirculation circuit for my tankless water heater system. I saw several reviews that said this worked for people, but it was not always clear whether they had a tankless system or not. Tankless water heaters require a minimum amount of water flow to turn on (typically ~0.5gpm) and after plumbing this pump and the bypass valve, I discovered that I would only get about 0.3gpm through my water heater. I tried all the power settings on the pump, "bleeding" the air with the screw on the front and flushing the lines, nothing helped. "Bleeding" with the air screw did let out some spits of air/water but the way the o-ring seal is designed, there is no way to get it to seal again while the pump is running so beware of doing that and/or be prepared to get wet. I "knew" that the fittings were 3/4" MIP so I also bought all the associated hardware to plumb this into the existing copper hardline on the INLET to my heater (used SharkBite fittings + 3/4" coupling to a 3/4" nipple so that I could have something rigid to use for mounting with 3/4" pipe clamps). The installation was fine except that even with a more-than-typical amount of teflon tape, I was not able to get a leak-free connection between the coupling and the pump. I made the connections quite tight and I was worried I would over-tighten and crack something. I did make a simple plywood base to allow the flat sections of the pump to rest since my pipe situation would not support the pump on its own.Since the pump did turn on and wasn't overheating or making any weird noises (it was very quiet actually), I assumed that I was just out of luck since the Grundfos valve kit I purchased actually did explicitly state that it was not for use with tankless water heaters (though it said the reason was that it was not designed to be used with systems that had a water-return circuit). After a couple of days I uninstalled the pump again to see if I could figure out if there was something mechanically wrong, and that is when I saw the RUST in the pump. I was very disappointed to see that and also very upset that I potentially put my family at risk for having that in our drinking water system. I also read someone else's review about making their own parallel valve circuit with two Grundfos valves and additional hoses/fittings to allow twice the flow through the valves. So in a second round of attempting to get functioning water circulation, I bought all the pieces needed for making the parallel valve setup AND a stainless-steel version of this pump, but under a different name brand (BokyWok).Once I received the new parts, I first decided to just install the new pump and see if that would make any difference. I was surprised to find that there was actually an adapter in the kit that would connect to the pump with a 3/4" female O-RING fitting and then adapted to a true 3/4" NPT thread. I didn't end up using them, though, because I just tried to connect the SharkBite adapter hoses directly (the non-SharkBite end had a 3/4" female o-ring connector) and used some thick cardboard spacers to allow a standard 3/4" pipe clamp to secure the whole thing in place to my plywood base. After this simplified installation was done, I turned on the pump and the heater kicked on!! This was WITHOUT making any changes to the Grundfos thermal valve installation, and I was now seeing about 0.5-0.6gpm flow through the water heater.This has been installed for a couple of weeks and still working fine...returning the crappy pump I received and the now unnecessary additional thermal bypass valve components. Lots of small lessons here, but my biggest suggestion is to try at least a couple of pumps from multiple vendors if yours isn't working. I looked at many pumps and they all seem to be the exact same imported hardware with various branded stickers on them (including the "official" Grundfos ones). ## Frequently Bought Together - KOLERFLO 3/4 Inch Hot Water Circulating Pump 3-Speed Circulation Water Pump for Solar Heater System(RS15-6 Red) - Leviton 2321 20 Amp, 250 Volt, NEMA L6-20P, 2P, 3W, Locking Plug, Industrial Grade, Grounding - Black-White - Leviton 2320 20 Amp, 250 Volt, Flush Mounting Locking Receptacle, Grounding, Industrial Grade, V-0-MAX, pack of 1, Black --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/79632017-kolerflo-3-4-inch-hot-water-circulating-pump-3-speed](https://www.desertcart.co.uk/products/79632017-kolerflo-3-4-inch-hot-water-circulating-pump-3-speed) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-05*