When choosing a new coffee maker for your church or church hall, you have consider a few extra points as when simple choosing a large coffee maker for other locations, uses and groups.
Where will the coffee maker be installed? Do you have a fixed kitchen or tea point where you want to make coffee in church or do you need a coffee maker that can be moved around easily? And what are the plumbing and cleaning possibilities like? How much coffee to you need to brew? How often will you use it, once week on Sundays? More times, less times? Does the amount of coffee you need to brew vary greatly? For example do you plan to use the coffee maker as well for small group meetings and office hours as well for coffee hour after the main Sunday service? Last, but not least, you have to consider the safety of children. Churches have a lot of children running around, so you have to consider if the outside of the coffee maker gets hot and how stable it can be set up and installed. Below some ideas which type of coffee makers or machines might be suitable for use in a church environment and which are certainly not adequate:
Coffee Urn
Coffee urns are perhaps the most widely used coffee makers in a church or village hall. They are easy to install and clean. They are easy to transport when empty and can be installed everywhere where a powerpoint can be found.
A few drawbacks have also to be considered before deciding on a coffee urn for your church building:
Some of them can get hot on the outside, requiring installation well away from children and other vulnerable persons and / or crowds. Such coffee urns are best installed where only the people that are in charge of the church coffee can access them.
Urns are also not good at brewing only a small amount of coffee. They are best for regular use with roughly always the same, middle to large, amount of coffee needed. Their size can vary between 12 and 100+ cups produced per brew. Making them ideal to provide the after church coffee for middle to large sized congregations.
Filter Coffee Makers
Classical Filter Coffee Makers, you know the ones with with carafes (glass or thermos), are best for use for small groups, perhaps in the church office, as they normally only brew up to 12 -14 cups.
There are also large, industrial style, drip coffee makers available, but they might stretch your church budget a bit too much. If you go for the “classical household coffee maker” solution, you should buy two if they are also used for bigger groups. This way you can make more coffee with the second machine whilst you still serve coffee from the first.
Vacuum Coffee Makers
They might look great, stylish and elegant, but they are also fragile and temperamental to use. Not your ideal solution for a busy church environment. They resemble more post modern and futuristic laboratory equipment then heavy duty coffee brewing machines.
Percolators
Percolators, at least the old-fashioned ones that “re-brew” the coffee over and over agin are not suitable for church uses as you typically would like to “set and forget” the coffee maker before the church service. As classical percolators require to “break” the brew circle before the coffee becomes too strong and bitter. There are modern percolators available that are able to do that and they are a good choice as church coffee maker.
Using Instant Coffee or Coffee concentrate
Using either instant coffee or diluting concentrated coffee, prepared at home, with hot water is the least favorite of all my methods of serving coffee in church! Instant coffee is simply not the same as brewed coffee and handling the hot water kettle over and over again when serving coffee is just inviting accidents. When pressed for a decision I would opt for making a nice, very strong coffee concentrate at home, transporting it in an airtight container to church and diluting it their with boiling water. Better that then no church coffee at all 
Summary for how to choose a good, large coffee maker for your church
If you can find a coffee urn that is well insulated, doesn’t get hot on the outside and can be so installed that it is stable and provides at the same time the amount of coffee you need, that would be ideal. Good luck and God Bless.