Hot Numbers, Trumpington Street

The front of the Retail Coffee Menu (September 2016) from Hot Numbers cafe/roastery on Trumpington Street, Cambridge.Not long after I visited the original Hot Numbers on Cambridge’s Gwydir Street, back in September 2014, a new roastery/café was announced. Sadly it took me almost two years to get back to Cambridge to check it out, finally returning in June last year and again in September. This post is about the café-side of Hot Numbers, with the roastery appearing in its own Meet the Roaster feature in due course.

It’s all very different from Gwydir Street. Whereas that’s a large, open space, Trumpington Street is long and thin, with the counter at the front on the right and seating down either side. Looking at it, it’s a miracle that Hot Numbers managed to squeeze a roaster in, but it did, tucked in on the right-hand side at the back.

All the usual Hot Numbers coffee goodness is here, with two single-origins and a decaf available on espresso and two more on pour-over, plus a fifth on bulk-brew. There’s also lots of technology on show: a Sanremo Opera espresso machine, Mahlkönig Peak grinders & Marco Beverage Systems SP9s. These are backed up with a selection of loose-leaf tea, craft beer, wine, a small but decent food selection and some excellent cake choices.

You can read more of my thoughts after the gallery.

  • The Hot Numbers cafe and roastery on Trumpington Street, Cambridge.
  • While it only has a small store front, it goes back a long way (past the arch, in fact).
  • Talking of small store fronts, here it is, with benches either side of the door.
  • Inside, there's seating in both windows: these stools are to the left of the door...
  • ... while these are to the right.
  • There's also a padded seat against the wall, then this row of stools at the counter.
  • The view down Hot Numbers: it's busy in here!
  • There's more seating at the front, in the shape of these two tables opposite the counter.
  • One of the tables in more detail, up against a bench on the left-hand side.
  • Past the counter, Hot Numbers narrows & there's more seating, including a communal table.
  • That's on the right. Meanwhile, on the left, there are a couple of these small tables.
  • The view looking towards the front, showing the communal table and the two round tables.
  • There's still more to come though, as Hot Numbers narrows again. What's that on the right?
  • Through the doorway is Hot Numbers' Geisen roaster, a 6kg model.
  • The roaster in action.
  • Beyond the roaster is a narrow training lab and beyond that, a small office.
  • Back outside and there's just enough space for a bar on the right...
  • ... and tables on the left-hand side.
  • However, that's still not it. Even though we're at the back of Hot Numbers, there's a door...
  • ... which leads out to a large garden with loads more seating!
  • Back inside, and Hot Numbers is full of interesting features such as these lights & pictures.
  • Talking of lights, this beauty hangs in the front window, along with its reflections.
  • An alternate view.
  • Meanwhile, these lights hang over the counter.
  • Being a roastery as well as a coffee shop, Hot Numbers has a full range of beans...
  • ... which are on display on the retail shelves opposite the counter.
  • Sadly the old lever espresso machines at the top aren't for sale...
  • The counter is a two-part affair, a prep area to the left, coffee, etc, to the right.
  • We want the right-hand side where you order and where all the coffee is made.
  • The menus are on the wall behind the counter: this is the nameless coffee menu...
  • ... while you'll find all the other drinks over here.
  • Finally we have the beans (left) and the food (right).
  • The beans in more detail. This was the selection on my first visit in June...
  • ... while these were on offer during my return. Everything's changed except the decaf.
  • The full coffee set-up, with the espresso machine on the left, pour-over on the right.
  • The heart of the operation, the threee-group Sanremo Opera...
  • ... next to which are the grinders, espresso (left), filter (right) with bulk-brew in the centre.
  • The espresso grinders: two single-origins and one decaf, plus the bulk-brew flask.
  • Meanwhile, on the other side of the bulk-brew are the two filter grinders.
  • This used to be Hot Numbers' filter set-up: Clever Drippers and Syphons...
  • ... but between my first and second visits, a pair of Marco SP9s magically appeared.
  • If you're hungry there's a decent selection of food...
  • ... backed up with a scrumptious selection of cake.
  • That one looks particularly amazing.
  • My filter from my visit in June, beautifully served in a carafe with a cup on the side.
  • Despite this, on my return I couldn't resist putting the SP9s through their paces.
  • Hot Numbers doesn't use the adjustable stand, just putting the V60 on top of the jug.
  • The SP9 is an automated pour-over system, dispensing pre-programmed doses of water...
  • ... with breaks in between.
  • It can, if done properly, replicate almost any pour-over method.
  • My coffee, a Kenyan, complete with tasting/origin notes...
  • ... which, I have to say, are very comprehensive!
  • My coffee in the cup.
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The new (for me, at least) Hot Numbers presents a small profile at the southern end of Trumpington Street, although if you approach from the north, you get more of a feel for its size, since you can see that it goes a long way back, with windows punctuating front half of the left-hand side. This means that although it’s long and thin (perhaps the longest Coffee Spot, compared to its width, that I’ve ever visited), it’s a very bright space, with light from the windows at the front and sides, as well as more light right at the back.

Returning to the front, it’s a simple affair, with the door recessed between two windows. There are benches outside in front of either window, while inside, there are small bars in both windows, complete with stools for seating. A bench runs along the left-hand side, with two large tables in front of it, while on the opposite side is the counter, which is slightly back from the door, leaving space for a little nook to the right of the door with a bench and coffee table. You can also sit at one of several stools at the front end of the counter and watch your coffee being made.

Beyond the counter, Hot Numbers narrows. There are a pair of small, round tables to the left, and a large, communal table on the right. It then narrows again, to accommodate the roastery on the right, which is in its own long, thin space, visible through a doorway on the right. Down the left, a corridor-like space runs right to the back of Hot Numbers, with a bar against right-hand (roastery) wall, and a bench with small, round tables to left. Finally, right at back, there’s doorway to comparatively large, open garden, which also houses the toilets.

Hot Numbers only roasts single-origins, with a choice of two (Ethiopian/Guatemala for my latest visit) on espresso, another (Burundi) on bulk-brew filter and two more (a different Ethiopian and a Kenyan) on pour-over. Hot Numbers even takes its decaf seriously enough to list its origin (Brazil Santa Lucia) on the board along with everything else.

When I visited in June, I had a pour-over which was beautifully presented in a carafe with a cup on the side. Back then, Hot Numbers was using Syphons and Clever Drippers, but by my return in September, these had been replaced by a pair of Marco Beverage Systems SP9s, which, the baristas told me, had massively improved the work-flow.

I’d already tried the espresso at Gwydir Street, which is just as well since I couldn’t resist putting the SP9s through their paces. While I’d had coffee from an SP9 at coffee festivals, this was the first time I’d tried one in a coffee shop and it didn’t disappoint. I had a Kenyan through the V60, a juice brew with a touch of acidity. How much is down to the coffee itself or the SP9 I don’t know, but you can’t extract what’s not there, only make a mess of it, so in that sense the SP9 passed its first test. Another sign of a good coffee is that it holds its own as it cools. In this case, my coffee was still as juicy down to the last drop!

December 2017: Hot Numbers was a runner-up for the 2017 Best Roaster/Retailer Award.

4 TRUMPINGTON STREET • CAMBRIDGE • CB2 1QA +44 (0) 1223 300730
Monday 07:00 – 19:00 Roaster Hot Numbers (espresso + filter)
Tuesday 07:00 – 19:00 Seating Tables, Window-bar, Bar, Tables (outside)
Wednesday 07:00 – 19:00 Food Breakfast, Lunch, Sandwiches, Cake
Thursday 07:00 – 19:00 Service Order at Counter
Friday 07:00 – 19:00 Cards Amex, Mastercard, Visa
Saturday 07:00 – 18:00 Wifi Free (30 minutes)
Sunday 08:00 – 18:00 Power Limited
Chain Local Visits 4th June, 5th September 2016

You can see what fellow coffee-blogger and one-time Cambridge resident, Bex of Double Skinny Macchiato, made of Hot Numbers.

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3 thoughts on “Hot Numbers, Trumpington Street

  1. Pingback: Hot Numbers, Gwydir Street | Brian's Coffee Spot

  2. Pingback: Hot Numbers, Gwydir Street Update | Brian's Coffee Spot

  3. Pingback: 2017 Awards – Best Roaster/Retailer | Brian's Coffee Spot

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