Planet Saved, Family Hospitalized: A Heat Pump Love Story

Picture this: You walk into your own living room, ready to relax, and your spouse is dressed in full hazmat gear. Not because it’s Halloween, or the in-laws are visiting, but because the government says you need to “save the planet.” Welcome to the world of “green” heat pumps—a glorious technological leap forward in the same way New Coke was a glorious leap forward in soda. The only thing missing is a government-mandated sticker: “Now With Bonus Legionella!”

No, really. If you’re wondering why climate commissars keep demanding you tear out your trusty boiler and install the latest in eco-absurdity, it’s because nothing says “progress” like swapping one non-existent crisis for a very real, pneumonia-inducing germ. As feature image cartoon so accurately sums up, we’ve apparently reached the “just put on your spacesuit, honey” stage of climate policy.

Let’s check the scoreboard: Your heating bill is just as soul-crushingly high as ever, your water now doubles as a bacterial spa, but—good news!—the climate priests say you’re doing your part. All it cost you was your health, comfort, savings, and the right to heat your home without consulting an infectious disease specialist. Just remember to thank the experts.

If you think I’m joking, take a gander at “Heat Pumps and Hidden Legionella Health Risks”, which reads like a how-to manual for government-induced own goals.

“As the push for low-carbon heating accelerates, so too do the unintended health consequences. Heat pumps, especially those used for domestic hot water, often operate at lower temperatures than traditional boilers. This creates the perfect breeding ground for Legionella bacteria.”

Translation: That shiny, taxpayer-subsidized heat pump is less “Tesla of heating” and more “Chernobyl of water heaters.” Instead of harmless, invisible CO₂, you get a very visible, very deadly germ factory right under your roof. All courtesy of people who couldn’t change a tire, let alone run an energy policy.

But wait, there’s more. The “efficiency” magic of heat pumps comes from not heating your water to a temperature that actually kills bacteria. You know, like the way mankind has safely done for a century. Dr. Alan Watson, a microbiologist with the rare skill of noticing the obvious, spells it out:

“With traditional gas boilers, hot water is regularly heated to 60°C or above, killing off any bacteria. Heat pumps, to maintain efficiency, frequently store water at much lower temperatures. Unless properly managed, this is a textbook scenario for Legionella proliferation.”

Translation: The “experts” replaced your old boiler with a device that keeps water at exactly the right temperature for germs to thrive. But don’t worry, you can save the planet—just don’t breathe near your shower.

Of course, when it all blows up, the policy geniuses have a plan: run your heat pump hot enough to kill bacteria, but only once in a while, so you can still claim it’s “efficient.” As the article says:

“Manufacturers recommend a weekly or even daily heating cycle to 60°C to minimize Legionella risk. Yet this approach undermines the energy savings that supposedly justify the switch to heat pumps in the first place.”

You couldn’t make this up if you tried. It’s like selling a car that only works if you push it everywhere and then handing you a bumper sticker that says, “I’m saving the planet.”

Meanwhile, your heating bill hasn’t budged. As the cartoon’s doomed husband observes, “Bill’s as high as before.”

“Many homeowners report negligible reductions in their energy bills after switching to heat pumps, especially in older, less insulated properties. Meanwhile, the risks from inadequate water temperatures remain.”

In other words, you pay for the privilege of being a guinea pig in a government experiment—an experiment run by people who consider actual science optional whenever it conflicts with the latest Net Zero edict. All so the climate church can say you’re “doing your bit.”

The real comedy here isn’t in the cartoon—it’s in the fact that the same central planners who claim to be saving us from certain doom are so colossally incompetent they’re introducing killer germs into our homes. On purpose. When microbiologists point out the glaring problem, the response is classic: ignore the scientists, double down on the policy, and blame the public for not “trusting the science.”

If you want to sum up the Green Revolution, here it is:

  • Destroy the reliable.
  • Mandate the untested.
  • Ignore the consequences.
  • Accuse anyone who points out the obvious of heresy.

So go ahead, install that heat pump. Don your hazmat suit. Send a thank-you note to your local climate czar. After all, nothing says progress like paying more to shower in weaponized bathwater. The planet may or may not notice, but your immune system sure will.

Feature image by www.cartoonsbyjosh.com

4.8 25 votes
Article Rating

Discover more from Watts Up With That?

Subscribe to get the latest posts sent to your email.

53 Comments
Inline Feedbacks
View all comments
July 12, 2025 6:07 am

All courtesy of people who couldn’t change a tire,

Good one!

John Hultquist
Reply to  Steve Case
July 12, 2025 8:07 am

Just a few nights ago, the little hook thingy supplied with my F150 kit twisted like a cheap pretzel, leaving me 2 inches short of getting the spare on. A friend with a floor jack came to rescue me. 

John the Econ
Reply to  Steve Case
July 13, 2025 8:38 pm

Look at the kind of people being elected to office at all levels and appointed to run the bureaucracies; people who have never achieved anything outside of academia in the real world. It’s no joke that they couldn’t change a tire if their lives depended on it.

July 12, 2025 6:28 am

The federal government has already restricted the maximum temperature for both conventional gas and electric water heaters to below the temperature required to kill legionella bacteria. Heat pump water heaters might be worse, but not by much. I’m not sure it is even possible to periodically increase the stored water temperature to kill bacteria in the heater. However, the bacteria will colonize in the pipes and plumbing fittings, so it would be necessary to flush the entire hot water plumbing system with high temperature water.

Also, remember that the legionella bacteria do not magically appear in the water heater. They enter in the water supply, frequently treated and supplied by government agencies. These agencies and other water suppliers do not notify their customers when they deliver legionella contaminated water.

Reply to  Ed Reid
July 12, 2025 8:05 am

I don’t know what the government-restricted maximum temperature is, but my gas tankless heater is officially set at HAF (hot as f***).

cosmicwxdude
Reply to  Phil R
July 12, 2025 9:38 am

I think I may turn mine up a notch…it’s electric but I’ve never messed with it as I have to take a metal plate off to see the settings.

Reply to  Phil R
July 12, 2025 9:49 am

125 +/- 5F

IAMPCBOB
Reply to  Ed Reid
July 12, 2025 11:18 am

I keep our non-climate friendly hot water heater set at about 130 degree F. Yeah, it’s hotter than hades when washing dishes, but I know, too, that any random ‘legionella’ bacteria are being killed, too. We don’t normally have any young kids in the house.

What are they going to come up with next, to scare the beejesus out of everyone about?

Reply to  Phil R
July 12, 2025 2:10 pm

I have one of those instantaneous gas hot water heater.. does to 60C, which is good for a shower.

On the kitchen line I installed a 250L electric tank heater, set to HAF !

2hotel9
Reply to  Phil R
July 12, 2025 3:25 pm

I use gas hotwater heater, averages 130-135. I know in PA Health Dept will red flag businesses serving food if hot water is below 121.

2hotel9
Reply to  Ed Reid
July 12, 2025 3:21 pm

9 times out of ten the municipal water company has no idea what is actually in their water beyond certain level of chlorine.

oeman50
Reply to  2hotel9
July 13, 2025 6:59 am

I was wondering if chlorine residual kills legionella. Turns out it is “not very effective” in killing legionella, according to a quick search.

2hotel9
Reply to  oeman50
July 13, 2025 7:16 am

Yes indeed. Level of chlorine needed to kill it is far in excess of what municipal water suppliers use. There are far more effective things for that, anyway. I know some of the people working for our water company, most of them I would not allow to operate an above ground swimming pool.

George V
July 12, 2025 6:36 am

Leaving out the bacteria issue, lower temps for hot water seems like a zero-sum game. If the water isn’t as hot coming from the heater, you just use more water from the heater when taking a shower, a bath, or washing up. Water heater runs more, and so uses more energy.

Of course, if the water isn’t as hot, you run out of hot water sooner, leaving someone in the shower cussing and fussing as they rinse off with cold water!

MarkW
Reply to  George V
July 12, 2025 8:37 am

The savings from lower temperatures comes from all the times when you aren’t using the water heater. The water heater radiates less heat when it’s not as hot.

John XB
July 12, 2025 6:42 am

Not in the UK. Regulations state that domestic hot water must be stored at 60C or higher, and hot water should be distributed at a minimum of 50°C within one minute at outlets to ensure Legionella control.

This is what adds to the cost in the UK of heat pump installation. A copper storage cylinder is required with an electric immersion heater to heat and keep water at 60C minimum.

Also many if not most gas-boilers are demand boilers, activated by flow when a hot water tap is opened to heat cold water taken directly from the mains to be delivered at the minimum required temperature. In this way Legionella is not a problem because no hot water is stored.

But. In many houses when new demand boilers were fitted, the copper cylinders were removed and the cupboards/spaces they occupied repurposed. New-build or remodelled houses just don’t have provision for copper cylinders to store water, and it would require significant work build cupboards and to run hot water pipes from them to kitchen and bathrooms.

Reply to  John XB
July 12, 2025 7:09 am

The CDC has water temperature recommendations to counter Legionella:

Store hot water at temperatures above 140°F (60°C). Ensure hot water in circulation doesn’t fall below 120°F (49°C) and recirculate hot water continuously, if possible.

Canada has similar recommendations:

Set the temperature of your water heater to 60°C (140°F) to prevent the growth of harmful bacteria such as Legionella.

July 12, 2025 6:45 am

All courtesy of people who couldn’t change a tire

It’s actually very difficult to change a (car) tyre (or tire). Very few people do it.

Changing a wheel is far more common..,

Mr.
Reply to  Zig Zag Wanderer
July 12, 2025 6:53 am

I love the spell of pedantry in the morning.

Scarecrow Repair
Reply to  Mr.
July 12, 2025 7:27 am

You just have to counter with even more pedantry.

Scarecrow Repair
Reply to  Zig Zag Wanderer
July 12, 2025 7:27 am

It’s even harder to change just the wheel. Changing both at the same time as a unit is far more common.

Reply to  Scarecrow Repair
July 12, 2025 7:49 am

good one!

John Hultquist
Reply to  Scarecrow Repair
July 12, 2025 8:17 am

My reply up above needs expanded. My 2019 F150 usually has the spare chained under the truck bed. It is a pain to get to on slush and freezing rain. I moved it into the bed to get to easily and check the pressure. The scissor type lift kit is crap (newer ones may be better), and a person needs to practice once before trying to replace a blown tire on a dark and narrow highway. I also suggest carrying a good light, wood blocks, and a better jack. {I got the blown tire off but couldn’t get the spare on — full of air, they are larger.}

Scarecrow Repair
Reply to  John Hultquist
July 12, 2025 10:16 am

Trying to peer through that narrow tunnel to get the crank through and lined up exactly right is a real pain, and I can’t imagine night and snow and rain make it any easier. The only time I’ve had to change my truck tire (wheel, rim, round thing), the ground was not flat, so the standard jack didn’t reach far enough, and when I moved the truck, the ground was soft dirt and the jack went down instead of the truck going up. So now a block of wood and a much better jack stay with the truck.

Reply to  Scarecrow Repair
July 12, 2025 11:48 am

It sounds like some new tires are needed by you guys. 🙂

Scarecrow Repair
Reply to  Tom Abbott
July 12, 2025 10:07 pm

25 years, one flat?

derbrix
Reply to  John Hultquist
July 13, 2025 4:56 am

Can agree with the F150 spare tire difficulties.

What I have done with my 2008 F150 is to replace all five (5) tires at the same time ensuring they are all identical. The tires are replaced every 6 years because the rubber compounds deteriorate greatly by that time. Tread wear is a very poor indicator of a tire’s health. The wimpy scissor jack was replaced with a hydraulic jack and jack stand combo. Simple and very stable. LED battery powered floodlight is always in cab and recharged as needed.

Reply to  Scarecrow Repair
July 12, 2025 8:52 am

ok, fun with pedantry. A “wheel” comprises two parts, the tire and the rim. If you are changing the wheel, you are by definition changing the tire at the same time. 🙂

Scarecrow Repair
July 12, 2025 7:24 am

Pardon this American asking a question from ignorance …

British stories always mention boilers. Is that just a different term for the American “hot water heaters”, or is it a real boiler which produces steam heat, with hot tap water as a side benefit?

Reply to  Scarecrow Repair
July 12, 2025 7:45 am

A UK house heating boiler will typically heat water for circulation through steel radiators to 60 to 80 degrees C. No steam is involved, with gas, or oil fired boilers you have a flame from a gas or oil burner that plays on a steel chambered water jacket in the boiler to heat the water until the boiler thermostat turns the burner off when the water is up to temp. So for early season heating you set the boiler to 60C, in depths of a cold spell you set it to 80C. The same heated water can be looped into a hot water tank coil for indirect heating or in a Combination it heats the hot tap water directly.

I think you call them furnaces, which to us in the UK is for melting metal.

Rick C
Reply to  kommando828
July 12, 2025 8:21 am

In the US they are called “hydronic heating systems”, but the term boiler is still commonly used even though steam is very rare in single residential heating. Steam boilers and heating are still used in older high rise and multiunit buildings with central heating units servicing many occupancies.

sturmudgeon
Reply to  Rick C
July 12, 2025 11:12 am

Yep. Loved the “radiators”, ‘way back when’.

Scarecrow Repair
Reply to  kommando828
July 12, 2025 10:09 am

A US furnace burns oil (old mostly) or gas and creates heat directly, no water involved. They do have air-to-air heat exchangers.

OweninGA
Reply to  Scarecrow Repair
July 12, 2025 5:18 pm

There are still many hot water heating systems with radiators out there. Mostly older homes, but they exist. The house my wife grew up in was heated that way. The house my parents moved into after I left for college also has a gas boiler in the basement that heats to about 85C. Those examples are Maryland and Illinois.

Reply to  Scarecrow Repair
July 12, 2025 8:11 am

Can’t speak for the UK but I have a “zone” on my boiler that provides my home heating that heats the water in a hot water storage tank. No stand-alone “water heater” is needed.

Reply to  AGW is Not Science
July 12, 2025 9:38 am

I’ve got that too. Last summer it failed. Replaced it- and it cost 3K. I was pissed but I needed it done fast and didn’t want to shop around. Had my oil company (it’s an oil burner) do it- they proved full plumbing services. They had installed a new furnace 4-5 years ago and know the system. But still, I was shocked at the price for essentially a giant thermos. The connections to the furnace are rather complex so I suppose that’s how they justify it. It seems any plumbing service in Wokeachusetts is super expensive. There is a shortage of plumbers, apparently- driving up cost. Can’t blame them- I’d probably do the same. I was in a profession with too many people so few of us made much $$$.

Paul Seward
Reply to  Scarecrow Repair
July 12, 2025 10:35 am

A boiler heats water that is circulated to heat the house. A water heater heats domestic water to shower with. A furnace heats air which heats the house. A boiler with a “sidearm” can heat a closed circuit loop that will heat domestic water

July 12, 2025 7:54 am

 Welcome to the world of “green” heat pumps—a glorious technological leap forward in the same way New Coke was a glorious leap forward in soda.

Or in the same way Dylan Mulvaney was a glorious leap forward in beer advertising.

sturmudgeon
Reply to  Phil R
July 12, 2025 11:15 am

Thanks for the memories…

2hotel9
Reply to  Phil R
July 12, 2025 3:38 pm

Tranny fluid, STAT!!! That joke is never going to get old.

July 12, 2025 8:03 am

Planet Saved, Family Hospitalized: A Heat Pump Love Story
How soon will Nick show up to point out the completely irrelevant nitpick that the title of this post is misleading because no families were hospitalized?

July 12, 2025 10:09 am

But I liked “New Coke.”

Reply to  Mike McMillan
July 12, 2025 11:17 am

Hey, quick everyone, we found him!

2hotel9
Reply to  Zig Zag Wanderer
July 12, 2025 3:39 pm

You so funny!

July 12, 2025 10:13 am

If you want to sum up the Green Revolution, here it is:

  • Destroy the reliable.
  • Mandate the untested.
  • Ignore the consequences.
  • Accuse anyone who points out the obvious of heresy.

The identical policy brought to bear in imposing the mRNA spike shot on everyone. And by the same politicians, What a surprise.

Bruce Cobb
July 12, 2025 1:04 pm

Speaking of “New Coke” and bad ideas, we had an Edsel back in the early 60s. Fun car. We were driving down some highway in Connecticut, and the steering wheel came off in my mother’s hands. I was in the front seat, so she handed it to me. She was still able to steer it to the next exit, and to a gas station. Yup, fun. I got to pretend I was steering.

2hotel9
July 12, 2025 3:18 pm

It still amazes me people do not clean their AC, furnace and duct work. Just changing a filter ain’t getting it done, chi’drens.

Tom Johnson
July 12, 2025 5:30 pm

The story doesn’t make sense to me. I’ve showered almost everyday for the past70 years in water from a water heater that never ever reached 60 degrees C (140 F). Most people in the US could also say the same.

Similarly, the water in a heat pump, even the heat pumps that generate domestic hot water, never have the heat pump internal water mix with the water in the hot water heater. This makes the temperature within the primary heat pump irrelevant. 140 F water heaters would also be considerably unsafe. I’m not a particular fan of heat pumps, but I find them acceptable. My preference is for condensing gas furnaces for heating.

I have installed and used heat pumps since 1988, that first one being a ground water heat pump that also provided domestic hot water as well as heating and AC.. It pulled 52 degree ground water from our well, and dumped the colder water to a lake. My present heat pumps are air to air.

Reply to  Tom Johnson
July 12, 2025 11:03 pm

“I’ve showered almost everyday for the past70 years in water from a water heater that never ever reached 60 degrees C (140 F)”

Did you have to add cold water to take a shower… if so, how do you know the temperature in the storage unit was not 60C+ ?

Bob
July 12, 2025 6:58 pm

So if 60 Celsius is the safe temperature, why isn’t it mandated? If 60 Celsius is mandated then that is the temperature required for all efficiency tests and I suspect heat pumps lose at that temperature.

Gregg Eshelman
July 13, 2025 12:04 am

If you need a larger hot water supply but can’t fit one in the space available, there’s a trick to virtually increase the capacity. Turn the temperature up and install a cold water mixing valve. That mixes a bit of cold water with the extra hot water coming out of the water heater to bring the temperature down to a save level. The capacity of the heater is extended by the volume of cold water mixed in. Go to a Home Depot or Lowes or Menards and you should find some water heaters with factory installed mixing valves.

Arthur Jackson
July 13, 2025 1:07 pm

My heat pump is geothermal and the intake water doesn’t mix with the drinking water except at the bottom of the well. Waste water in the summer is used for irrigation, waste water in the winter is pumped in a loop back down the well. I’m not sure where the legionella would grow? My hot water has a pre-heater that is in the heat pump a possible source of bacteria growth, but my water tank is heated to germ killing temperatures by Ready Kilowatt. Unless the bacteria is adept at swimming up stream I’m not going to worry. Also, how would the bacteria get in there in the first place? I’m a skeptic on most health issues. This looks like a load of horse hockey to me.

July 15, 2025 11:46 am

I have frequented this Site for over two decades. I have never seen an article or comment on the fact that Heat pumps for heating your home or Hot Water attract and maintain an ideal nest space for Mice, Moles and other vermin.
My first Heat pump had the wiring chewed up by mice, Then, after placing mouse bait to get rid of them the Relay used for activating the pump and fan was urinated on by the next mouse that moved in and needed replaced, I now check the mouse bait and monthly and replace if needed. Same problem with the second and then the third HP.
As one of my responsibilities at the NPP I worked for was initial verification of meeting the Design Specifications, I decided that since I could repair the HP myself as all of the problems were electrical I decided after the second repair bill of over $400 to repair the HP myself.

Verified by MonsterInsights