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$29.30
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Plumbers Do It With Pressure Hoffman Differential Coffee Mug

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Classic Mug
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Style: Classic Mug

Give a made-to-order mug from Zazzle to someone special, or treat yourself to a design that brings you joy or makes you laugh. Create your own photo mug, shop our collection of the funniest joke mugs, personalise your mug with a monogram, or express yourself with one of our 10 million designs.

  • Available in 325 ml or 443 ml
  • Dimensions:
    • 325 ml: 8.1 cm D x 9.7 cm H
    • 443 ml: 8.6 cm D x 11.4 cm H
  • Microwave and dishwasher safe
  • Use caution when removing the mug from the microwave. Use a pot holder or glove as necessary if it is too hot to the touch. Do not microwave an empty mug
  • Strong, ceramic construction
  • Meets FDA requirements for food and beverage safety
  • Do not overfill and be careful with hot liquids that may scald
  • Keep out of reach of children when filled with hot liquid

About This Design

Plumbers Do It With Pressure Hoffman Differential Coffee Mug

Plumbers Do It With Pressure Hoffman Differential Coffee Mug

Plumbers will enjoy this mug featuring the US Patent 1777333 by William K Simpson for The Hoffman Differential Loop along with the truism saying "Plumbers Do It With Pressure." The Hoffman Differential Loop, a device with no moving parts, keeps water in the boiler by making sure that under no circumstance could pressure in the boiler exceed 10 ounces higher than the return piping. It does this by bleeding pressure into the returns after 10 ounces was reached in the boiler. Thus, for example, if the boiler reached 11 ounces in it, then 1 ounce would be bled into the return pipes, since at no time could the return pipes be more than 10 ounces different than the boiler. What this means is that water would always be able to return to the boiler and steam would always flow since there was a differential pressure between the supply and return pipes. This device maintains an unvarying water line in the boiler independent of boiler pressure, which means that water in the boiler is never lowered to a point where the heat from the fire can exert a destructive influence on the boiler. Celebrate technology that is still applicable today in the home heating systems of old houses with this mug featuring a 20th century invention!

Customer Reviews

4.8 out of 5 stars rating22.2K Total Reviews
19585 total 5-star reviews1889 total 4-star reviews326 total 3-star reviews140 total 2-star reviews220 total 1-star reviews
22,160 Reviews
Reviews for similar products
5 out of 5 stars rating
By Leanne G.4 January 2021Verified Purchase
Classic Mug, 444 ml
Zazzle Reviewer Program
Very happy with the outcome of prints.. Just note just hoping they don’t wear off like my last mug. Thanku. The wording on the mug appears 10/10👍Thanku
5 out of 5 stars rating
By Sharon C.29 January 2021Verified Purchase
Classic Mug, 444 ml
Creator Review
The quality of these larger mugs is very good. I have been putting mine through the dishwasher all the time and it shows no signs of fading or dulling. Ergonomically these are lovely to hold and have fast become my favourite mug for a big cup of tea or coffee. Totally recommend getting the tea infuser with the mug especially if you like using loose leaf tea, which always tastes better from my experience and is better for the environment. Printing was good, bright and most importantly accurately matches the colouring shown on the website.
5 out of 5 stars rating
By A.3 December 2018Verified Purchase
Combo Mug, 325 ml
Zazzle Reviewer Program
Exactly as advertised. Amazed by the fast delivery, within a week and to my door, how easy is that ! Packaging secure and safe. Product as seen on website. Everything perfect. This first time customer will be back ! Purchased one for me and two as gifts. Product Perfect. Colour perfect too.

Tags

Mugs
hoffman differential loopplumbersdo it with pressureplumbing technologyus patent 1777333older home steam heating systemplumbing inventor geek humourhoffman equalising loopboiler pressureinventor invention
All Products
hoffman differential loopplumbersdo it with pressureplumbing technologyus patent 1777333older home steam heating systemplumbing inventor geek humourhoffman equalising loopboiler pressureinventor invention

Other Info

Product ID: 168342932306567188
Added on 11/8/22, 2:02 am
Rating: G