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The installed cost seems a bit high but there are a number of factors that would influence the price. First is where you live. Plumbing labor costs in Northern CA are some of the highest in the country. How many zones the system has also impacts the price. With a 4,000 sq ft house I'd expect many zones and consequently a lot of piping. The Weil Boiler you mention is a good one and is probably about 10% more efficient than what you have now. Diesel boiler is a very general term. If you want some input on the boiler you have now I'd need a brand and model number.
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