Number of People	Tank Capacity	Element Rating	Marathon Model
1	30	3800	MR30238
2	40	3800	MR40238
3	40 50	3800 or 4500 3800	MR40238 MR50238 (available in a low-boy model)
4	50 75	3800 or 4500 3800	MR50245 (available in a low-boy model) MR75238
5	75 85	3800 3800	MR75238 MR85238
6	85	3800	MR85238
7+	85 105	4500 3800	MR85245 MR105238

Note: All models include brass drain valve, factory installed T&P and vacuum relief and 4 ft of pipe insulation All models have 2.5” of Envirofoam® insulation The last two digits of the model number indicate the element wattage The existing tank size and customer satisfaction with it can be the best guide to size requirement