Planning to do this mid-week - Its essentially my Cream Ale recipe with the maize subbed for Rye and a bit of a hop change to let the spicy rye character shine through, also using Vienna instead of Munich cos ive run out of Munich :o(
Guestimate? You can sparge with cold water and not see any major drops in efficiency, I also infuse with boiling water for my sparge addition and have never gone over 80C in the mash tun, but I guess that's equipment dependant.
I bought a digital thermometer a few months back and it showed I was about 5-10 deg cooler with my manual one. Anyway, the main effect this was having apart from mashing where I wanted it was that my sparge water was hotter (78-80-deg) and it resulted in about 5% gain in my efficiency. At least that's my theory, don;t want to freak Reviled out. 5%, It may not sound significant but when your efficiency is in the 50s it is.
What I ended up doing was boiling the water in the kettle (1.8L) then tipping out about a third and replacing with tap water.. Ive done it before and it gets it close, so im sure ill be fine... Not normally worried about efficiency just this is quite a small beer so it does matter alot more!
Funny you mention this brew day cock-up. It must be a week for it.
I had a similar "guesstimate" nightmare after a little cellar flood the other day. I lost a set of scales (they're hanging up and will hopefully dry out). Unfortunately the batteries in the back-up kitchen scales had run out - or they'd been infected with Rajaijah juice. I didn't realise until 6.30am on brew day morning, and time was short, so I had to wing it with the grist and mash-in before DSE opened.
Eastie Boy's Amber Sunshower Styrian Ale
About 88% Global Vienna
About 7% Crystal 90
About 3% Crystal 250
About 2% Pale Chocolate
Mashed at 65c for 60min
1.5g/L NZ Styrian 5.5%aa @60min
2.5g/L NZ Styrian 5.5%aa @ 15min
2.5g/L NZ Styrian 5.5%aa @ 0min
US05 at 18c rising to 20c
1.052, 36ibu
Not sure how my estimates went as the beer looked considerably darker than I'd envisaged... time will tell.
I'm tentatively lining up a brew day for this weekend... three in a row would be a record for me.
I had to hunt around for them... that's for sure. I can confirm that they were NOT easy yo come by. Most of the breweries I spoke to didn't want to give anything up at all.