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I’ve had a local church ask me to lower the cistern as it has no cold feed and no water on site to get it there. The boiler is a Powrmatic Sime and the old church warden is having to climb a 3m ladder with a watering can once a month. I went round and worked back from the tallest rad with a laser level and it’s around 2m above the boiler and the head tank is about 4m above the boiler. Just checked online and the manual says a 2m head is required so was wondering if you guys had any input to whether I can lower it to around 500 above rad height which would still give enough height from the boiler which sits below ground level.