UK Combi Boiler water to hot.

[Simon47]

From watching stuff on telly, it seems that what we call an unvented cylinder with immersion heater is common in the US. Mythbusters did a bit on what happens if they explode...
They had to defeat all the safety features (thermostats, over pressure & over temp valves), but they managed it. The bottom seam failed and cylinder launched upwards, punching through a floor and roof of the skeleton house they'd put together

 

[Megawatt]

From watching stuff on telly, it seems that what we call an unvented cylinder with immersion heater is common in the US. Mythbusters did a bit on what happens if they explode...
They had to defeat all the safety features (thermostats, over pressure & over temp valves), but they managed it. The bottom seam failed and cylinder launched upwards, punching through a floor and roof of the skeleton house they'd put together

Yes they can build up so much pressure it’s like a bomb but myth busters just showed what could happen after they defeated all the safety's such as the pressure relief valve and thermostat which would open when it gets to close to the pressure.

 

[Simon47]

What do you call them over there ?
Over here it would generally be referred to as an unvented cylinder.
And yes, Mythbusters had to disable multiple safeties - thus demonstrating why we have the regs we do to make them safe.

 

[Megawatt]

What do you call them over there ?
Over here it would generally be referred to as an unvented cylinder.
And yes, Mythbusters had to disable multiple safeties - thus demonstrating why we have the regs we do to make them safe.

Just a plain old hot water heater and mine is 50 gallons so we don’t run out of hot water

 

[Simon47]

That would be confusing to us, as "hot water heater" could mean so many things ! We have instantaneous heaters, of which the gas (or oil) fired combi is one; vented cylinders (the traditional approach); unvented cylinders (needs all the safety stuff to be safe(ish)); thermal stores and heat banks; ...
And of course, each of the cylinders (or storage tanks) can be heated by different means, so that makes lots of permutations.
And head into the plumbing section of some forums, and you'll find supposedly professional plumbers state with pride how they'll never install (or recommend to a customer asking their advice) anything but a combi

 

[Megawatt]

That would be confusing to us, as "hot water heater" could mean so many things ! We have instantaneous heaters, of which the gas (or oil) fired combi is one; vented cylinders (the traditional approach); unvented cylinders (needs all the safety stuff to be safe(ish)); thermal stores and heat banks; ...
And of course, each of the cylinders (or storage tanks) can be heated by different means, so that makes lots of permutations.
And head into the plumbing section of some forums, and you'll find supposedly professional plumbers state with pride how they'll never install (or recommend to a customer asking their advice) anything but a combi

Hot water heater is just a phrase. You can call it what you want but it is electric or gas it has 2 heating elements in it with 1 thermostat for the top element and 1 thermostat for the bottom element and it has a setting on the first thermostat. It will go up to 140 degrees but I advise people to set it at 110 degrees Fahrenheit