Everybody has a tap they don't trust. You turn it on, walk away, check your phone, and come back when it's finally warm.
Below: where that wait actually comes from, why the smoke alarm always picks 3 a.m., the first burn that decides a candle's whole life, why the pruning shears stay in the shed this month, the gaps opening up in wood floors, and a $9.99 roll that keeps hot pipes warmer.
Reply and tell us: which tap in your house takes the longest? We read every one.
Why the Hot Water Takes So Long
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Your water heater isn't slow. It's full of hot water the whole time you're standing there.
The wait is the pipe.
Between the heater and your tap runs a length of pipe full of water. It was hot the last time someone used it, and it's been cooling to room temperature ever since. Hot water can't reach you until all of that has come out of the faucet first.
How much water is that? Per GreenBuildingAdvisor, 50 feet of half-inch pipe holds 0.8 gallons, and 50 feet of three-quarter-inch pipe holds 1.4 gallons.
So the wait is simple division: the gallons sitting in the pipe, divided by how many gallons a minute your tap runs.
That explains most of what you've noticed:
The bathroom sink is the worst. A water-saving faucet running half a gallon a minute on a 50-foot run of three-quarter-inch pipe takes almost three minutes to go hot.
The shower is quicker. Running 2 gallons a minute, it clears that same 1.4 gallons in about 40 seconds.
The second use is instant. The pipe is still full of hot water from the first.
The far bathroom is always last. More pipe, more water to push out.
Here's the part that surprises people. A low-flow faucet makes the wait longer, but it doesn't waste more water. The pipe holds the same gallons either way.
Building scientist Allison Bailes of Energy Vanguard adds a wrinkle: slow flow through a big pipe lets hot and cold water mix, which stretches the wait past what the pipe alone would suggest.
You can't shorten your pipes without a plumber. You can stop wasting what comes out of them. Keep a pitcher by the tap and catch the cold water for the plants or the kettle.
Why the Smoke Alarm Picks 3 a.m.
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It's never 3 in the afternoon. The low-battery chirp always seems to wait until you're asleep, and that isn't bad luck.
Per Kidde, a battery near the end of its life builds up internal resistance. A drop in room temperature pushes that resistance higher, until the battery can't deliver what the alarm needs.
And most homes are coolest between 2 a.m. and 6 a.m.
So the alarm chirps in the small hours, then goes quiet once the house warms up. That's why a chirp that stopped by breakfast hasn't fixed itself. It'll be back tomorrow night, a little earlier.
Find the alarm that's chirping while it's still doing it.
Swap the battery the same day.
Press the test button to confirm it sounds.
Swap the batteries in the others too. Kidde's advice is to replace them all, since they were likely installed together.
If a fresh battery doesn't stop the chirp, the alarm itself may be at the end of its life. We went through reading the date on the back on September 11.
The First Burn Decides a Candle's Whole Life
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A candle that burns a narrow hole down the middle, leaving a thick wall of wax around the jar, is called tunneling. It almost always started on night one.
Wax has a memory. Per the National Candle Association, if the first burn is too short for the melted pool to reach the edges, it leaves a ring the candle follows for the rest of its life.
The rule is one hour of burning for every inch of the candle's width. A 3-inch candle needs three hours the first time.
Trim the wick to a quarter inch before you light it.
Set it away from fans, vents and open windows.
Let it burn until the pool reaches the edge, one hour per inch of width.
Don't let it run past four hours at a stretch, and let it cool two hours before relighting.
Stop when about half an inch of wax is left, so the base of the jar doesn't overheat.
Trimming the wick every time pays too. The association says it can make a candle last up to 25% longer.
Put the Pruning Shears Away Until Late Winter
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Fall feels like tidy-up season, and an overgrown shrub is the first thing that catches your eye. Leave it.
K-State Research and Extension explains why. A plant heading into dormancy isn't making the new tissue that would protect a fresh cut, so a fall wound sits open going into winter.
Timing depends on when the shrub blooms:
Spring bloomers, like lilac and forsythia, set next year's flower buds on this year's growth. Cut them now and you cut off next spring's flowers. Prune them within four to six weeks after they finish blooming.
Summer bloomers, like butterfly bush and crape myrtle, flower on new growth. Prune them in late winter or early spring.
One exception holds all year: dead, dying, broken or hazardous limbs can come off any time. A cracked branch hanging over the driveway doesn't wait for March.
The Gaps Opening in Your Wood Floor
If you have wood floors, you may notice thin dark lines between the boards over the next few weeks. Don't panic.
The National Wood Flooring Association puts it simply: wood reacts to its environment. When the heat comes on, indoor air dries out, the boards give up moisture and shrink, and gaps open between them.
Gaps that appear in winter and close again in summer are normal, per the association. We covered why winter air turns so dry on September 23.
So don't fill them. Wood filler forced into a winter gap has nowhere to go when the boards swell back in July.
The test is the calendar. If the gaps are large, or still open in the humid months, that's the point to call a flooring pro.
The $9.99 Roll That Keeps Hot Pipes Warmer
You can't make your pipes shorter. You can slow down how fast the water sitting in them goes cold.
The one we'd point you to is Frost King's Foil-Backed Fiberglass Pipe Wrap, at $9.99 a roll. It's 3 inches wide, 1 inch thick and 25 feet long, rated R-3.3.
One roll covers about 12 feet of three-quarter-inch pipe, 17 feet of half-inch or 10 feet of one-inch, per the retailer's listing. Start with the hot pipe leaving the water heater, in the basement or utility closet where you can reach it.
Why fiberglass instead of the foam tubes? It's safe close to the heater. The Department of Energy's Building America Solution Center says to keep insulation at least 6 inches from a gas water heater's flue, and to use fiberglass or mineral wool on pipe within 8 inches of it.
We haven't wrapped a basement with this one ourselves. The specs and the price come from the retailer's own listing.
Two things to know. Fiberglass itches, so wear gloves and long sleeves. And it won't do much for the first tap of the morning, since the water will cool overnight anyway. Its real work is keeping the pipe hot between uses a little later in the day.
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One quick tap
That's Wednesday: the pipe behind the wait, the 3 a.m. chirp, a candle's first night, shears on hold, and floor gaps that come and go.
Tonight's job is a pitcher by the bathroom sink. You'll be surprised how fast it fills.
Forward this to whoever in your house always gets the cold shower.
See you tomorrow.
The Home Wire
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