Dock Bubbler - Best Practices

[Lakegeezer]

After a few winters, it seems like a good time to exchange stories again on dock bubblers. Everyone’s setup is a little different, and I’m curious about what people have found works well in real life. How long do you tend to run them, whether timing matters, and how you position or aim the fan. I’m especially interested in approaches that keep docks safe while keeping the open-water footprint as small as practical along the shoreline. Do you let some ice form and clear it as needed, or try to keep things open all the time? If you’ve adjusted your setup over the years based on what you’ve seen, tell us what’s worked for you.

[DickR]

Although my own dock is crank-up, I've helped monitor/adjust a neighbor's bubbler, and I oversee a friend's bubbler operation elsewhere through the winter. In both cases, the "bubbler" (aka "circulator") is the typical configuration of electric motor with a propeller, which produces an upward and inward flow of water during an operating interval. A timer, digital or mechanical, provides selection of multiple ON intervals and the duration of each.

An operating strategy that works well in one location may not work well in another, particularly when exposed to a lot of wind over a huge expanse of ice. In any case, when spring brings melting of the ice pack at the shorelines and the pack becomes mobile, wind can move the pack, however slowly, faster than a bubbler can melt it. Spring typically is when most dock damage is suffered, and that's up to Mother Nature.

I think it's better to have more short ON times than a few very long ON times. Once the upflow of water has taken out any ice formed since the last interval ended, continued operation accomplishes nothing. One thing a long ON interval does do is set a larger mass of water in motion, and when that inward flow reaches the shoreline it flows laterally, in some cases melting out the ice all the way across a neighbor's property, preventing his access to the ice. Furthermore, it's arguably better to have the the ice pack anchored to the shore on either side of the dock, to help retard movement of the ice pack when the wind blows.

Sources can be found that give expected ice formation rate vs. air temperature. Keeping any ice at all from forming around a dock when the bubbler is not running is not really needed. A very thin layer of ice doesn't have an awful lot of strength to it, and a bubbler doesn't need much time to remove such a thin layer. Some timers, like the old favorite Intermatic, allow intervals in 15-minute increments. Others provide 30-minute increments, one of which I think is sufficient in most situations. One such interval every three or four hours means a 2.5 or 3.5 hour interval of OFF time between ON times, and that's not an awful lot of time for ice formation.

In the case of a multi-dock installation protected by two or more bubblers, the schedule of ON intervals can be staggered across the bubblers, so that the area served by one bubbler can be partially served by the flow from another.

I'm sure others will have their own thoughts on this. It's a hot topic during the winter, as there are too many installations where bubblers run far too long, with little oversight, to the dismay of abutters.

[VitaBene]

Thanks Bill!!

[LIforrelaxin]

The best practice is to Monitor, the situation..... I have seen to many people use the set it and forget it principal. While I understand this if your property is on an island, I don't understand it when the property is accessible through the winter.

As DickR rightful points out there are a number of variables, and they aren't consistent year to year... What may work this year may not work so well next year.

On top of this, what people tend to forget, is the biggest source of damage, comes when the ice starts shifting around... Once the sheets are formed, when they decided to move they are moving until they are stopped.... regardless of Dock Bubblers.... Use a bubbler sparingly, you will anchor ice in front of what you are keeping open, and fend off at least for a while moving sheets.........

[Pine Island Guy]

my solution may not be for everyone, but after many years of changing things around, this is what I have found works best on my dock...

As the posters before me have said, bubblers do very little when the ice is breaking up and large sheets of ice are being blown into your dock! However this time of year it is important to keep the water from freezing around cribs and pilings. Especially with the extremely low lake level, if the ice freezes solid around dock pilings and the lake level begins to rise... the ice will try and lift the pilings along with the water level...

I use a combination of a timer and thermostat (and living pretty much year-round on the island I can adjust as needed). The timer is tied to the outlet, the thermostat next, then the ice-eater plugged into that. This way the bubbler will only activate during the time periods I've selected and ONLY if the temperature hits 30F (and agree with the previous posts that a few sporadic times are better than an extended time). This combination keeps my power bills lower. The "time on" schedule is only during the daytime, my thinking is that it won't freeze up too much overnight, the temps are warmer during the day and if there is sun, it all helps to break up anything.

So far so good, now we just need some ice!!! -PIG

[Dockbubblers]

Hello, I'm happy to answer any questions. We've tried to make our website informative with a guided system selection section and several informational links and videos:
- https://dockbubblers.com/
- https://dockbubblers.com/pages/how-it-works
- https://dockbubblers.com/pages/dockb...tems-selection
- https://www.youtube.com/@Dockbubblers
While we started in NH, we have customers across the northern states, including Wisconsin, Michigan, NY, NJ, PA, MA, etc.
Happy to answer any questions.
- Craig

[Alex444]

A thermostat and timer setup seems like the best balance. Running a de-icer nonstop can use a lot more electricity than necessary, especially during milder stretches.

Placement seems to matter just as much as runtime too. You really only need to keep enough water moving around the pilings or dock structure to prevent solid ice from locking everything in place.

For those who have used an Ice Eater or similar dock de-icer for a few winters, have you found it works better mounted vertically or angled toward the dock?

[Alex444]

I’ve had the best results treating the bubbler as a way to manage a small problem area rather than trying to keep a huge section of shoreline open.
Placement and angle seem to matter more than just running it constantly. I’d aim it so the circulation protects the pilings and immediate dock area, then use a thermostat or timer so it only runs when conditions actually call for it.
I also prefer letting some ice form naturally as long as the structure itself stays protected. Keeping the open-water footprint smaller feels safer around the shoreline and usually means less unnecessary runtime.
Curious whether anyone here has found a big difference between aiming the unit more vertically versus angling it under the dock.

[camp guy]

When I lived in a lake house, I found the best position for the bubbler was about 5 feet past the end of the dock, angled to direct its current stream toward the second pilings back. This kept the pilings free of icing up. My main concern was the floe ice blowing down Winter Harbor, slowly, but with the energy momentum of tons of ice. The bubbler did nothing to solve the floe ice problem. I can remember spending, literally, hours on my dock with a long pole trying to just ease the floe ice past the end of my dock to avoid losing the first section. As far as timers and thermostats go, I ran it most nights, and some days during the coldest stretch.
As I have said before on this Forum, you can't beat Mother Nature, all you can hope for is a little relief.

[Alex444]

Good discussion here. One thing that makes a big difference with dock bubblers and ice eaters is getting the placement right. You want enough water movement to reduce ice buildup around the dock and pilings without creating a much larger open-water area than necessary.

Water depth, the direction of circulation, and local winter conditions all play a role. A timer or thermostat-based controller can also help manage operating time, although the right setup depends on the equipment and conditions.

For anyone comparing equipment, Midwest Ponds has a collection of lake dock deicers with different options for winter dock protection:

https://midwestponds.com/collections/lake-dock-deicers

I'd also recommend checking the manufacturer's installation guidelines and local requirements for marking open water. Even when the surface looks frozen, a running deicer can create dangerously thin ice beyond the visible opening.

The goal should be effective dock protection while minimizing unnecessary open water and keeping nearby lake users safe.

[Alex444]

One thing worth considering with dock de-icers is how much water movement you actually need. Water depth, ice thickness, and the direction of circulation can all affect how well a system keeps ice away from dock pilings.

For Lake Winnipesaukee winters, I'd also look into using a thermostat to avoid running the unit when it's not needed. Proper placement is important because too much circulation can create a larger area of open water than expected, which can become a safety concern.

Has anyone noticed a significant difference between dock bubblers and propeller-style ice eaters during extended freezing temperatures?

[Lakegeezer]

I too am interested in the best practices for air bubblers vs the fans. I'm starting to think that fans should be banned, but they are effective. My neighbor rebuild their seasonal dock to be year-round and installed a fan. Even though they are good about keeping the open water area small, the ice along my property went from solid to rotten. This year, for the first time in 25 years, pond weed started growing off the end of my dock - to the point that when swimming, it tangles with my feet. Yuck! When the fans turn on, the damage is done in the first few seconds. It sucks at the bottom, pulling muck and nutrients up into the water column. The lake doesn't flow fast - but it flows and with a wind over the melted ice-hole, it goes faster. The nearby shoreline is fed plant food. I don't know if I will ever be able to get rid of the new crop of pond weed off my dock, but I wish there were new rules put in place to get rid of fans and ideally, year-round docks in locations where seasonal would do. The lake is indeed changing.

[Alex444]

Good point about keeping the open-water area as small as possible. With dock deicers and ice eaters, I think proper positioning is just as important as runtime. Angling the water flow toward the pilings can help limit ice buildup without opening up too much of the shoreline. MidWest Ponds has some useful guidance on these setups. One thing I'd also watch is changing lake levels, since ice forming around pilings can create problems as the water rises. A timer and thermostat combination seems like a practical approach, provided the setup is checked regularly.

[camp guy]

During all the years I lived on Winter Harbor I had my bubbler system out past my last dock posts aiming back toward the dock, and it worked pretty well. But I didn't have immediate neighbors with docks, so I wasn't paying attention to the opening I was creating (it was generally fairly large). After reading through these posts again, the thought came to mind about how it would have worked had I put the working end at the near end of the dock and moved the water outward, not disturbing the shoreline ice. Fortunately, I had enough water depth at the inboard end to allow this, but I never tried it.
Even the Town of Wolfeboro puts the ice eaters at the outboard ends of the docks.
Just thought.

[Alex444]

For winter ice control around a dock, I'd focus on water depth, circulation direction, and how the equipment is mounted.

A circulation-based ice eater can help move relatively warmer water toward the surface and reduce ice buildup around selected areas. But the results depend on the installation depth, motor capacity, and winter conditions.

EasyPro has different pond deicers https://easypro.com/collections/de-icers, including circulation-based options, if you're comparing equipment for dock protection.

I'd also make sure the electrical connections are suitable for waterfront use and keep people away from the surrounding ice, since it can be much thinner than it looks.

[Lakegeezer]

After additional research, I learned of New Hampshire's updated law (RSA 270:33, via SB 594, effective August 4, 2026 - ie, this year) which now restricts deicing devices strictly to protecting legally existing permanent structures adjacent to your shoreline from ice damage. You can no longer run a bubbler for a seasonal dock or for an unpermitted permanent dock.

If you have an older, unpermitted permanent dock, it only qualifies as "legally existing" (grandfathered) if it was built and has remained unchanged in size, location, and configuration since before state permitting rules began on July 2, 1969.

Also in that updated ruling the warning sign readability grew from 150 feet to 200 feet.